I found an interesting list of countries ranked by median wealth by adult. It is based on a 2016 study by Credit Suisse. It's surprising to see that Americans, Germans and Swedes are poorer in average than Spaniards, Taiwanese or South Koreans. I didn't expect Belgians to rank so high. Median wealth favours countries with low income inequality and is therefore also an indicator of how wealthy a population is in average.
[TABLE="class: wikitable sortable jquery-tablesorter"]
[TR]
[TH="class: headerSort, bgcolor: #EAECF0, align: center"]Country[/TH]
[TH="class: headerSort, bgcolor: #EAECF0, align: center"]Total Wealth
(in billions USD)[/TH]
[TH="class: headerSort, bgcolor: #EAECF0, align: center"]Wealth per adult
(USD)[/TH]
[TH="class: headerSort headerSortDown, bgcolor: #EAECF0, align: center"]Median wealth per adult
(USD)[/TH]
[/TR]
[TR]
[TD="align: left"]
Switzerland[/TD]
[TD]3,478[/TD]
[TD]561,854[/TD]
[TD]244,002[/TD]
[/TR]
[TR]
[TD="align: left"]
Australia[/TD]
[TD]6,428[/TD]
[TD]375,573[/TD]
[TD]162,815[/TD]
[/TR]
[TR]
[TD="align: left"]
Belgium[/TD]
[TD]2,293[/TD]
[TD]270,613[/TD]
[TD]154,815[/TD]
[/TR]
[TR]
[TD="align: left"]
Japan[/TD]
[TD]24,070[/TD]
[TD]230,946[/TD]
[TD]120,493[/TD]
[/TR]
[TR]
[TD="align: left"]
United Kingdom[/TD]
[TD]14,150[/TD]
[TD]288,808[/TD]
[TD]107,865[/TD]
[/TR]
[TR]
[TD="align: left"]
Italy[/TD]
[TD]9,973[/TD]
[TD]202,288[/TD]
[TD]104,105[/TD]
[/TR]
[TR]
[TD="align: left"]
France[/TD]
[TD]11,891[/TD]
[TD]244,365[/TD]
[TD]99,923[/TD]
[/TR]
[TR]
[TD="align: left"]
Canada[/TD]
[TD]7,564[/TD]
[TD]270,179[/TD]
[TD]96,664[/TD]
[/TR]
[TR]
[TD="align: left"]
Netherlands[/TD]
[TD]2,412[/TD]
[TD]184,378[/TD]
[TD]81,118[/TD]
[/TR]
[TR]
[TD="align: left"]
South Korea[/TD]
[TD]6,278[/TD]
[TD]159,914[/TD]
[TD]64,636[/TD]
[/TR]
[TR]
[TD="align: left"]
Taiwan[/TD]
[TD]3,199[/TD]
[TD]172,847[/TD]
[TD]63,134[/TD]
[/TR]
[TR]
[TD="align: left"]
Spain[/TD]
[TD]4,396[/TD]
[TD]116,320[/TD]
[TD]56,500[/TD]
[/TR]
[TR]
[TD="align: left"]
United States[/TD]
[TD]84,784[/TD]
[TD]344,692[/TD]
[TD]44,977[/TD]
[/TR]
[TR]
[TD="align: left"]
Germany[/TD]
[TD]12,419[/TD]
[TD]185,175[/TD]
[TD]42,833[/TD]
[/TR]
[TR]
[TD="align: left"]
Sweden[/TD]
[TD]1,683[/TD]
[TD]227,295[/TD]
[TD]39,692[/TD]
[/TR]
[TR]
[TD="align: left"]
Mexico[/TD]
[TD]1,621[/TD]
[TD]21,125[/TD]
[TD]6,066[/TD]
[/TR]
[TR]
[TD="align: left"]
China[/TD]
[TD]23,393[/TD]
[TD]22,864[/TD]
[TD]4,885[/TD]
[/TR]
[TR]
[TD="align: left"]
Brazil[/TD]
[TD]2,537[/TD]
[TD]18,059[/TD]
[TD]3,811[/TD]
[/TR]
[TR]
[TD="align: left"]World[/TD]
[TD]255,708[/TD]
[TD]52,819[/TD]
[TD]2,222[/TD]
[/TR]
[TR]
[TD="align: left"]
Indonesia[/TD]
[TD]1,769[/TD]
[TD]10,772[/TD]
[TD]1,966[/TD]
[/TR]
[TR]
[TD="align: left"]
India[/TD]
[TD]3,099[/TD]
[TD]3,835[/TD]
[TD]608[/TD]
[/TR]
[/TABLE]
The same study also list the number of millionaires in USD by country in 2016 (page 42). I have calculated the percentages for each country.
Many countries are missing from the statistics including Iceland, Finland, Luxembourg, New Zealand and Gulf states.
[TABLE="class: wikitable sortable jquery-tablesorter"]
[TR]
[TH="class: headerSort, bgcolor: #EAECF0, align: center"]Country[/TH]
[TH="class: headerSort, bgcolor: #EAECF0, align: center"]Total Wealth
(in billions USD)[/TH]
[TH="class: headerSort, bgcolor: #EAECF0, align: center"]Wealth per adult
(USD)[/TH]
[TH="class: headerSort headerSortDown, bgcolor: #EAECF0, align: center"]Median wealth per adult
(USD)[/TH]
[/TR]
[TR]
[TD="align: left"]

[TD]3,478[/TD]
[TD]561,854[/TD]
[TD]244,002[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]6,428[/TD]
[TD]375,573[/TD]
[TD]162,815[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]2,293[/TD]
[TD]270,613[/TD]
[TD]154,815[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]24,070[/TD]
[TD]230,946[/TD]
[TD]120,493[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]14,150[/TD]
[TD]288,808[/TD]
[TD]107,865[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]9,973[/TD]
[TD]202,288[/TD]
[TD]104,105[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]11,891[/TD]
[TD]244,365[/TD]
[TD]99,923[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]7,564[/TD]
[TD]270,179[/TD]
[TD]96,664[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]2,412[/TD]
[TD]184,378[/TD]
[TD]81,118[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]6,278[/TD]
[TD]159,914[/TD]
[TD]64,636[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]3,199[/TD]
[TD]172,847[/TD]
[TD]63,134[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]4,396[/TD]
[TD]116,320[/TD]
[TD]56,500[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]84,784[/TD]
[TD]344,692[/TD]
[TD]44,977[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]12,419[/TD]
[TD]185,175[/TD]
[TD]42,833[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]1,683[/TD]
[TD]227,295[/TD]
[TD]39,692[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]1,621[/TD]
[TD]21,125[/TD]
[TD]6,066[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]23,393[/TD]
[TD]22,864[/TD]
[TD]4,885[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]2,537[/TD]
[TD]18,059[/TD]
[TD]3,811[/TD]
[/TR]
[TR]
[TD="align: left"]World[/TD]
[TD]255,708[/TD]
[TD]52,819[/TD]
[TD]2,222[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]1,769[/TD]
[TD]10,772[/TD]
[TD]1,966[/TD]
[/TR]
[TR]
[TD="align: left"]

[TD]3,099[/TD]
[TD]3,835[/TD]
[TD]608[/TD]
[/TR]
[/TABLE]
The same study also list the number of millionaires in USD by country in 2016 (page 42). I have calculated the percentages for each country.
- Switzerland : 8.5%
- Australia : 4.4%
- Denmark : 4.2%
- United States : 4.19%
- Norway : 3.7%
- United Kingdom : 3.3%
- Canada : 3.0%
- Sweden : 2.9%
- Belgium : 2.7%
- Singapore : 2.6%
- Austria : 2.5%
- Japan : 2.2%
- Germany : 1.9%
- Italy : 1,85%
- Netherlands 1.7%
- Taiwan : 1.5%
- South Korea : 1.3%
- Spain : 0.8%
- China : 0.1%
- South Africa : 0.1%
Many countries are missing from the statistics including Iceland, Finland, Luxembourg, New Zealand and Gulf states.