-9.49% is the change from 906 to 820
Calculation steps:
[( 820 - 906 ) ÷ 906] x 100 = -9.49%
Formula
Percentage change = [(820 - 906) / 906] x 100
Subtract the new number by the original number
820 - 906 = -86
-86 ÷ 906 = -0.09492273730684327
-0.09492273730684327 x 100 = -9.49%