-99.55% is the change from 221 to 1
Calculation steps:
[( 1 - 221 ) ÷ 221] x 100 = -99.55%
Formula
Percentage change = [(1 - 221) / 221] x 100
Subtract the new number by the original number
1 - 221 = -220
-220 ÷ 221 = -0.995475113122172
-0.995475113122172 x 100 = -99.55%