-71.99% is the change from 307 to 86
Calculation steps:
[( 86 - 307 ) ÷ 307] x 100 = -71.99%
Formula
Percentage change = [(86 - 307) / 307] x 100
Subtract the new number by the original number
86 - 307 = -221
-221 ÷ 307 = -0.7198697068403909
-0.7198697068403909 x 100 = -71.99%