-75.26% is the change from 671 to 166
Calculation steps:
[( 166 - 671 ) ÷ 671] x 100 = -75.26%
Formula
Percentage change = [(166 - 671) / 671] x 100
Subtract the new number by the original number
166 - 671 = -505
-505 ÷ 671 = -0.7526080476900149
-0.7526080476900149 x 100 = -75.26%