-74.74% is the change from 677 to 171
Calculation steps:
[( 171 - 677 ) ÷ 677] x 100 = -74.74%
Formula
Percentage change = [(171 - 677) / 677] x 100
Subtract the new number by the original number
171 - 677 = -506
-506 ÷ 677 = -0.7474150664697193
-0.7474150664697193 x 100 = -74.74%