-20.59% is the change from 811 to 644
Calculation steps:
[( 644 - 811 ) ÷ 811] x 100 = -20.59%
Formula
Percentage change = [(644 - 811) / 811] x 100
Subtract the new number by the original number
644 - 811 = -167
-167 ÷ 811 = -0.2059186189889026
-0.2059186189889026 x 100 = -20.59%