-19.98% is the change from 811 to 649
Calculation steps:
[( 649 - 811 ) ÷ 811] x 100 = -19.98%
Formula
Percentage change = [(649 - 811) / 811] x 100
Subtract the new number by the original number
649 - 811 = -162
-162 ÷ 811 = -0.1997533908754624
-0.1997533908754624 x 100 = -19.98%