-66.19% is the change from 210 to 71
Calculation steps:
[( 71 - 210 ) ÷ 210] x 100 = -66.19%
Formula
Percentage change = [(71 - 210) / 210] x 100
Subtract the new number by the original number
71 - 210 = -139
-139 ÷ 210 = -0.6619047619047619
-0.6619047619047619 x 100 = -66.19%