-91.92% is the change from 817 to 66
Calculation steps:
[( 66 - 817 ) ÷ 817] x 100 = -91.92%
Formula
Percentage change = [(66 - 817) / 817] x 100
Subtract the new number by the original number
66 - 817 = -751
-751 ÷ 817 = -0.9192166462668299
-0.9192166462668299 x 100 = -91.92%