-28.76% is the change from 306 to 218
Calculation steps:
[( 218 - 306 ) ÷ 306] x 100 = -28.76%
Formula
Percentage change = [(218 - 306) / 306] x 100
Subtract the new number by the original number
218 - 306 = -88
-88 ÷ 306 = -0.2875816993464052
-0.2875816993464052 x 100 = -28.76%