-90.52% is the change from 538 to 51
Calculation steps:
[( 51 - 538 ) ÷ 538] x 100 = -90.52%
Formula
Percentage change = [(51 - 538) / 538] x 100
Subtract the new number by the original number
51 - 538 = -487
-487 ÷ 538 = -0.9052044609665427
-0.9052044609665427 x 100 = -90.52%