-52.17% is the change from 207 to 99
Calculation steps:
[( 99 - 207 ) ÷ 207] x 100 = -52.17%
Formula
Percentage change = [(99 - 207) / 207] x 100
Subtract the new number by the original number
99 - 207 = -108
-108 ÷ 207 = -0.5217391304347826
-0.5217391304347826 x 100 = -52.17%