-19.5% is the change from 641 to 516
Calculation steps:
[( 516 - 641 ) ÷ 641] x 100 = -19.5%
Formula
Percentage change = [(516 - 641) / 641] x 100
Subtract the new number by the original number
516 - 641 = -125
-125 ÷ 641 = -0.19500780031201248
-0.19500780031201248 x 100 = -19.5%