-62.44% is the change from 221 to 83
Calculation steps:
[( 83 - 221 ) ÷ 221] x 100 = -62.44%
Formula
Percentage change = [(83 - 221) / 221] x 100
Subtract the new number by the original number
83 - 221 = -138
-138 ÷ 221 = -0.6244343891402715
-0.6244343891402715 x 100 = -62.44%