-51.08% is the change from 186 to 91
Calculation steps:
[( 91 - 186 ) ÷ 186] x 100 = -51.08%
Formula
Percentage change = [(91 - 186) / 186] x 100
Subtract the new number by the original number
91 - 186 = -95
-95 ÷ 186 = -0.510752688172043
-0.510752688172043 x 100 = -51.08%