-31.29% is the change from 310 to 213
Calculation steps:
[( 213 - 310 ) ÷ 310] x 100 = -31.29%
Formula
Percentage change = [(213 - 310) / 310] x 100
Subtract the new number by the original number
213 - 310 = -97
-97 ÷ 310 = -0.31290322580645163
-0.31290322580645163 x 100 = -31.29%