-85.05% is the change from 662 to 99
Calculation steps:
[( 99 - 662 ) ÷ 662] x 100 = -85.05%
Formula
Percentage change = [(99 - 662) / 662] x 100
Subtract the new number by the original number
99 - 662 = -563
-563 ÷ 662 = -0.850453172205438
-0.850453172205438 x 100 = -85.05%