-68.33% is the change from 221 to 70
Calculation steps:
[( 70 - 221 ) ÷ 221] x 100 = -68.33%
Formula
Percentage change = [(70 - 221) / 221] x 100
Subtract the new number by the original number
70 - 221 = -151
-151 ÷ 221 = -0.6832579185520362
-0.6832579185520362 x 100 = -68.33%