-75.11% is the change from 221 to 55
Calculation steps:
[( 55 - 221 ) ÷ 221] x 100 = -75.11%
Formula
Percentage change = [(55 - 221) / 221] x 100
Subtract the new number by the original number
55 - 221 = -166
-166 ÷ 221 = -0.751131221719457
-0.751131221719457 x 100 = -75.11%