-90.06% is the change from 513 to 51
Calculation steps:
[( 51 - 513 ) ÷ 513] x 100 = -90.06%
Formula
Percentage change = [(51 - 513) / 513] x 100
Subtract the new number by the original number
51 - 513 = -462
-462 ÷ 513 = -0.9005847953216374
-0.9005847953216374 x 100 = -90.06%