-90.34% is the change from 528 to 51
Calculation steps:
[( 51 - 528 ) ÷ 528] x 100 = -90.34%
Formula
Percentage change = [(51 - 528) / 528] x 100
Subtract the new number by the original number
51 - 528 = -477
-477 ÷ 528 = -0.9034090909090909
-0.9034090909090909 x 100 = -90.34%