Ftdna introduced this massive amount of data for Big Y
Too much to be explained, but check on net site under DNA-Explained for details, see link below
https://dna-explained.com/2019/01/24...-y-block-tree/
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My SNP came out as only 2 people , Myself and an English person........on our data, they did some combination to extract data and the following results are
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Detailed View: T-Z19945
ORIGINS
British Isles 42.59%
Southeast Europe 26.71%
Scandinavia 12.21%
Iberia 6.31%
East Europe 6.11%
Asia Minor 4.16%
Other (3 regions) 1.91%
Total
100%

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The only thing I have of a ancient/old find for SNP Z19945 of haplo T1a2 is from Jura Caves in north Switzerland.
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Currently I am still working out the finer points of this new data/findings , while at the same time ftdna keep making small changes to it