-83.05% is the change from 537 to 91
Calculation steps:
[( 91 - 537 ) ÷ 537] x 100 = -83.05%
Formula
Percentage change = [(91 - 537) / 537] x 100
Subtract the new number by the original number
91 - 537 = -446
-446 ÷ 537 = -0.8305400372439479
-0.8305400372439479 x 100 = -83.05%