About the poll... thanks to my almighty excel file and the power of pivot tables, I can easily check my annual digital share, either the totals or filtered by platform.
From 2006 to 2015 my annual digital share has grown from 0.34% to 75%:
"No" are physical games I don't have anymore, either I rented them for 1 - 2 weeks (f.e. Forza Horizon 2 on XBO, The Order & Watch_Dogs on PS4) or I resold them (difference of buying and selling price), so these costs belong to retail/physical.
If anyone wonders about PS4 games i bought in 2012: these are cross-buy titles like Journey, Flower and Sound Shapes, which were released later as PS4 version.