-71.98% is the change from 646 to 181
Calculation steps:
[( 181 - 646 ) ÷ 646] x 100 = -71.98%
Formula
Percentage change = [(181 - 646) / 646] x 100
Subtract the new number by the original number
181 - 646 = -465
-465 ÷ 646 = -0.7198142414860681
-0.7198142414860681 x 100 = -71.98%