-18.6% is the change from 258 to 210
Calculation steps:
[( 210 - 258 ) ÷ 258] x 100 = -18.6%
Formula
Percentage change = [(210 - 258) / 258] x 100
Subtract the new number by the original number
210 - 258 = -48
-48 ÷ 258 = -0.18604651162790697
-0.18604651162790697 x 100 = -18.6%