-93.75% is the change from 816 to 51
Calculation steps:
[( 51 - 816 ) ÷ 816] x 100 = -93.75%
Formula
Percentage change = [(51 - 816) / 816] x 100
Subtract the new number by the original number
51 - 816 = -765
-765 ÷ 816 = -0.9375
-0.9375 x 100 = -93.75%