-64.73% is the change from 258 to 91
Calculation steps:
[( 91 - 258 ) ÷ 258] x 100 = -64.73%
Formula
Percentage change = [(91 - 258) / 258] x 100
Subtract the new number by the original number
91 - 258 = -167
-167 ÷ 258 = -0.6472868217054264
-0.6472868217054264 x 100 = -64.73%