-86.02% is the change from 651 to 91
Calculation steps:
[( 91 - 651 ) ÷ 651] x 100 = -86.02%
Formula
Percentage change = [(91 - 651) / 651] x 100
Subtract the new number by the original number
91 - 651 = -560
-560 ÷ 651 = -0.8602150537634409
-0.8602150537634409 x 100 = -86.02%