-91.3% is the change from 586 to 51
Calculation steps:
[( 51 - 586 ) ÷ 586] x 100 = -91.3%
Formula
Percentage change = [(51 - 586) / 586] x 100
Subtract the new number by the original number
51 - 586 = -535
-535 ÷ 586 = -0.9129692832764505
-0.9129692832764505 x 100 = -91.3%