I have already found some numbers thanks to this website: http://www.ferimex.com/icc/frl.php?list=0&country=0&title=0&sex=0&year=0&old=0&cat=0&size=9&update=yes
- Top 50: 0 = 0%
- Top 100: 2 = 2%
- Top 200: 2 = 1%
- Top 300: 3 = 1%
- Top 400: 4 = 1%
- Top 500: 6 = 1.2%
- Top 600: 12 = 2%
- Top 700: 15 = 2.14%
- Top 800: 16 = 2%
- Top 900: 19 = 2.11%
- Top 1000: 29 = 2.9%
- Top 1100: 33 = 3%
- Top 1200: 36 = 3%
- Top 1300: 43 = 3.31%
- Top 1400: 45 = 3.21%
- Top 1500: 45 = 3%
- Top 1600: 49 = 3.06%
- Top 1700: 54 = 3.18%
- Top 1800: 57 = 3.17%
- Top 1900: 61 = 3.21%
- Top 2000: 65 = 3.25%
And I plotted the graph:
It's clearly increasing.
But I couldn't go higher than top 2000. I hope that someone will be able to extend the graph for higher values (for higher values the graph should be smoother because there will be less statistical fluctuations).