-63.35% is the change from 221 to 81
Calculation steps:
[( 81 - 221 ) ÷ 221] x 100 = -63.35%
Formula
Percentage change = [(81 - 221) / 221] x 100
Subtract the new number by the original number
81 - 221 = -140
-140 ÷ 221 = -0.6334841628959276
-0.6334841628959276 x 100 = -63.35%