-17.95% is the change from 635 to 521
Calculation steps:
[( 521 - 635 ) ÷ 635] x 100 = -17.95%
Formula
Percentage change = [(521 - 635) / 635] x 100
Subtract the new number by the original number
521 - 635 = -114
-114 ÷ 635 = -0.1795275590551181
-0.1795275590551181 x 100 = -17.95%