-20.24% is the change from 820 to 654
Calculation steps:
[( 654 - 820 ) ÷ 820] x 100 = -20.24%
Formula
Percentage change = [(654 - 820) / 820] x 100
Subtract the new number by the original number
654 - 820 = -166
-166 ÷ 820 = -0.20243902439024392
-0.20243902439024392 x 100 = -20.24%