-37.89% is the change from 161 to 100
Calculation steps:
[( 100 - 161 ) ÷ 161] x 100 = -37.89%
Formula
Percentage change = [(100 - 161) / 161] x 100
Subtract the new number by the original number
100 - 161 = -61
-61 ÷ 161 = -0.37888198757763975
-0.37888198757763975 x 100 = -37.89%