-20.34% is the change from 816 to 650
Calculation steps:
[( 650 - 816 ) ÷ 816] x 100 = -20.34%
Formula
Percentage change = [(650 - 816) / 816] x 100
Subtract the new number by the original number
650 - 816 = -166
-166 ÷ 816 = -0.2034313725490196
-0.2034313725490196 x 100 = -20.34%