-50.99% is the change from 202 to 99
Calculation steps:
[( 99 - 202 ) ÷ 202] x 100 = -50.99%
Formula
Percentage change = [(99 - 202) / 202] x 100
Subtract the new number by the original number
99 - 202 = -103
-103 ÷ 202 = -0.5099009900990099
-0.5099009900990099 x 100 = -50.99%