-95.6% is the change from 91 to 4
Calculation steps:
[( 4 - 91 ) ÷ 91] x 100 = -95.6%
Formula
Percentage change = [(4 - 91) / 91] x 100
Subtract the new number by the original number
4 - 91 = -87
-87 ÷ 91 = -0.9560439560439561
-0.9560439560439561 x 100 = -95.6%