-15.5% is the change from 258 to 218
Calculation steps:
[( 218 - 258 ) ÷ 258] x 100 = -15.5%
Formula
Percentage change = [(218 - 258) / 258] x 100
Subtract the new number by the original number
218 - 258 = -40
-40 ÷ 258 = -0.15503875968992248
-0.15503875968992248 x 100 = -15.5%