-31.33% is the change from 316 to 217
Calculation steps:
[( 217 - 316 ) ÷ 316] x 100 = -31.33%
Formula
Percentage change = [(217 - 316) / 316] x 100
Subtract the new number by the original number
217 - 316 = -99
-99 ÷ 316 = -0.31329113924050633
-0.31329113924050633 x 100 = -31.33%