-71.21% is the change from 646 to 186
Calculation steps:
[( 186 - 646 ) ÷ 646] x 100 = -71.21%
Formula
Percentage change = [(186 - 646) / 646] x 100
Subtract the new number by the original number
186 - 646 = -460
-460 ÷ 646 = -0.7120743034055728
-0.7120743034055728 x 100 = -71.21%