-53.8% is the change from 671 to 310
Calculation steps:
[( 310 - 671 ) ÷ 671] x 100 = -53.8%
Formula
Percentage change = [(310 - 671) / 671] x 100
Subtract the new number by the original number
310 - 671 = -361
-361 ÷ 671 = -0.5380029806259314
-0.5380029806259314 x 100 = -53.8%