-97.96% is the change from 636 to 13
Calculation steps:
[( 13 - 636 ) ÷ 636] x 100 = -97.96%
Formula
Percentage change = [(13 - 636) / 636] x 100
Subtract the new number by the original number
13 - 636 = -623
-623 ÷ 636 = -0.9795597484276729
-0.9795597484276729 x 100 = -97.96%