-91.05% is the change from 570 to 51
Calculation steps:
[( 51 - 570 ) ÷ 570] x 100 = -91.05%
Formula
Percentage change = [(51 - 570) / 570] x 100
Subtract the new number by the original number
51 - 570 = -519
-519 ÷ 570 = -0.9105263157894737
-0.9105263157894737 x 100 = -91.05%