-20.32% is the change from 817 to 651
Calculation steps:
[( 651 - 817 ) ÷ 817] x 100 = -20.32%
Formula
Percentage change = [(651 - 817) / 817] x 100
Subtract the new number by the original number
651 - 817 = -166
-166 ÷ 817 = -0.20318237454100369
-0.20318237454100369 x 100 = -20.32%