-29.9% is the change from 311 to 218
Calculation steps:
[( 218 - 311 ) ÷ 311] x 100 = -29.9%
Formula
Percentage change = [(218 - 311) / 311] x 100
Subtract the new number by the original number
218 - 311 = -93
-93 ÷ 311 = -0.2990353697749196
-0.2990353697749196 x 100 = -29.9%