-70.99% is the change from 817 to 237
Calculation steps:
[( 237 - 817 ) ÷ 817] x 100 = -70.99%
Formula
Percentage change = [(237 - 817) / 817] x 100
Subtract the new number by the original number
237 - 817 = -580
-580 ÷ 817 = -0.7099143206854345
-0.7099143206854345 x 100 = -70.99%