-85.08% is the change from 811 to 121
Calculation steps:
[( 121 - 811 ) ÷ 811] x 100 = -85.08%
Formula
Percentage change = [(121 - 811) / 811] x 100
Subtract the new number by the original number
121 - 811 = -690
-690 ÷ 811 = -0.8508014796547472
-0.8508014796547472 x 100 = -85.08%