Player efficiency WN8 algorithm

A new way to calculate WoT player efficiency. You will find description in Wiki

0-299
very bad
300-449
bad
450-649
below average
650-899
average
900-1199
above average
1200-1599
good
1600-1999
very good
2000-2449
great
2450-2899
unicum
2900-999999
super unicum