-70.74% is the change from 311 to 91
Calculation steps:
[( 91 - 311 ) ÷ 311] x 100 = -70.74%
Formula
Percentage change = [(91 - 311) / 311] x 100
Subtract the new number by the original number
91 - 311 = -220
-220 ÷ 311 = -0.707395498392283
-0.707395498392283 x 100 = -70.74%