Society Was Prussia in 1795 a Slavic-majority country?

[Tomenable]

Georg Hassel in his 1805 book gives the ethnic structure of the Kingdom of Prussia:

Nationalverschiedenheit:

Deutsche - 5,286,000
Slawen - 4,212,900
Juden - 250,000
Franzosen - 65,000
Griechen - 39,000
Wallonen - 2,600
Tataren - 500

Total population - 9,856,000

However, Hassel does not clearly say for which year is his data. At least I can't find it.

If his data is for year 1805 then the territory of Prussia in 1805 was larger than in 1795.
Between years 1795 and 1805 Prussia annexed large German-majority areas in the west:

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So perhaps in 1795 Prussia was actually a Slavic-majority country (specifically Polish).

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Below is the population by province (the total is a bit different - 9,851,000 instead of 9,856,000):
Based on these provinces are you able to tell if the numbers refer to year 1805 or another year?

 

[Tomenable]

Both Münster and Paderborn are included by Hassel, so his numbers must refer to the year 1803 at the earliest.
So Hassel's data on Prussia's population reflects the situation after the Reichsdeputationshauptschluss of 1803.

 

[Tomenable]

In December 1805 Prussia annexed Hanover but ceded Ansbach and Kleve. And Hassel's data doesn't include Hanover.
So Hassel's data is probably from 1805 but before December. Surely between 1803-1805.

 

[Tomenable]

Hassel's numbers probably come from one of these sources:

"Annalen der Preuss. Staatswirtschaft und Statstik 1804",
or "Das Handbuch über den Kön. Preuss. Staat von 1804".

So his numbers probably reflect the situation as of year 1804.