-70.16% is the change from 305 to 91
Calculation steps:
[( 91 - 305 ) ÷ 305] x 100 = -70.16%
Formula
Percentage change = [(91 - 305) / 305] x 100
Subtract the new number by the original number
91 - 305 = -214
-214 ÷ 305 = -0.7016393442622951
-0.7016393442622951 x 100 = -70.16%