-28.96% is the change from 221 to 157
Calculation steps:
[( 157 - 221 ) ÷ 221] x 100 = -28.96%
Formula
Percentage change = [(157 - 221) / 221] x 100
Subtract the new number by the original number
157 - 221 = -64
-64 ÷ 221 = -0.2895927601809955
-0.2895927601809955 x 100 = -28.96%