-30.99% is the change from 313 to 216
Calculation steps:
[( 216 - 313 ) ÷ 313] x 100 = -30.99%
Formula
Percentage change = [(216 - 313) / 313] x 100
Subtract the new number by the original number
216 - 313 = -97
-97 ÷ 313 = -0.30990415335463256
-0.30990415335463256 x 100 = -30.99%