-80.23% is the change from 258 to 51
Calculation steps:
[( 51 - 258 ) ÷ 258] x 100 = -80.23%
Formula
Percentage change = [(51 - 258) / 258] x 100
Subtract the new number by the original number
51 - 258 = -207
-207 ÷ 258 = -0.8023255813953488
-0.8023255813953488 x 100 = -80.23%