-70.21% is the change from 866 to 258
Calculation steps:
[( 258 - 866 ) ÷ 866] x 100 = -70.21%
Formula
Percentage change = [(258 - 866) / 866] x 100
Subtract the new number by the original number
258 - 866 = -608
-608 ÷ 866 = -0.7020785219399538
-0.7020785219399538 x 100 = -70.21%