-29.87% is the change from 308 to 216
Calculation steps:
[( 216 - 308 ) ÷ 308] x 100 = -29.87%
Formula
Percentage change = [(216 - 308) / 308] x 100
Subtract the new number by the original number
216 - 308 = -92
-92 ÷ 308 = -0.2987012987012987
-0.2987012987012987 x 100 = -29.87%