-67.71% is the change from 511 to 165
Calculation steps:
[( 165 - 511 ) ÷ 511] x 100 = -67.71%
Formula
Percentage change = [(165 - 511) / 511] x 100
Subtract the new number by the original number
165 - 511 = -346
-346 ÷ 511 = -0.6771037181996086
-0.6771037181996086 x 100 = -67.71%