-67.12% is the change from 511 to 168
Calculation steps:
[( 168 - 511 ) ÷ 511] x 100 = -67.12%
Formula
Percentage change = [(168 - 511) / 511] x 100
Subtract the new number by the original number
168 - 511 = -343
-343 ÷ 511 = -0.6712328767123288
-0.6712328767123288 x 100 = -67.12%