-19.88% is the change from 161 to 129
Calculation steps:
[( 129 - 161 ) ÷ 161] x 100 = -19.88%
Formula
Percentage change = [(129 - 161) / 161] x 100
Subtract the new number by the original number
129 - 161 = -32
-32 ÷ 161 = -0.19875776397515527
-0.19875776397515527 x 100 = -19.88%