-18.11% is the change from 635 to 520
Calculation steps:
[( 520 - 635 ) ÷ 635] x 100 = -18.11%
Formula
Percentage change = [(520 - 635) / 635] x 100
Subtract the new number by the original number
520 - 635 = -115
-115 ÷ 635 = -0.18110236220472442
-0.18110236220472442 x 100 = -18.11%