-31.61% is the change from 310 to 212
Calculation steps:
[( 212 - 310 ) ÷ 310] x 100 = -31.61%
Formula
Percentage change = [(212 - 310) / 310] x 100
Subtract the new number by the original number
212 - 310 = -98
-98 ÷ 310 = -0.3161290322580645
-0.3161290322580645 x 100 = -31.61%