-65.73% is the change from 817 to 280
Calculation steps:
[( 280 - 817 ) ÷ 817] x 100 = -65.73%
Formula
Percentage change = [(280 - 817) / 817] x 100
Subtract the new number by the original number
280 - 817 = -537
-537 ÷ 817 = -0.6572827417380661
-0.6572827417380661 x 100 = -65.73%