-64.5% is the change from 200 to 71
Calculation steps:
[( 71 - 200 ) ÷ 200] x 100 = -64.5%
Formula
Percentage change = [(71 - 200) / 200] x 100
Subtract the new number by the original number
71 - 200 = -129
-129 ÷ 200 = -0.645
-0.645 x 100 = -64.5%
Example