-93.76% is the change from 817 to 51
Calculation steps:
[( 51 - 817 ) ÷ 817] x 100 = -93.76%
Formula
Percentage change = [(51 - 817) / 817] x 100
Subtract the new number by the original number
51 - 817 = -766
-766 ÷ 817 = -0.9375764993880049
-0.9375764993880049 x 100 = -93.76%