-73.73% is the change from 651 to 171
Calculation steps:
[( 171 - 651 ) ÷ 651] x 100 = -73.73%
Formula
Percentage change = [(171 - 651) / 651] x 100
Subtract the new number by the original number
171 - 651 = -480
-480 ÷ 651 = -0.7373271889400922
-0.7373271889400922 x 100 = -73.73%