-19.88% is the change from 649 to 520
Calculation steps:
[( 520 - 649 ) ÷ 649] x 100 = -19.88%
Formula
Percentage change = [(520 - 649) / 649] x 100
Subtract the new number by the original number
520 - 649 = -129
-129 ÷ 649 = -0.1987673343605547
-0.1987673343605547 x 100 = -19.88%