-29.55% is the change from 308 to 217
Calculation steps:
[( 217 - 308 ) ÷ 308] x 100 = -29.55%
Formula
Percentage change = [(217 - 308) / 308] x 100
Subtract the new number by the original number
217 - 308 = -91
-91 ÷ 308 = -0.29545454545454547
-0.29545454545454547 x 100 = -29.55%