-22.54% is the change from 661 to 512
Calculation steps:
[( 512 - 661 ) ÷ 661] x 100 = -22.54%
Formula
Percentage change = [(512 - 661) / 661] x 100
Subtract the new number by the original number
512 - 661 = -149
-149 ÷ 661 = -0.2254160363086233
-0.2254160363086233 x 100 = -22.54%