-49.31% is the change from 509 to 258
Calculation steps:
[( 258 - 509 ) ÷ 509] x 100 = -49.31%
Formula
Percentage change = [(258 - 509) / 509] x 100
Subtract the new number by the original number
258 - 509 = -251
-251 ÷ 509 = -0.4931237721021611
-0.4931237721021611 x 100 = -49.31%