-33.53% is the change from 343 to 228
Calculation steps:
[( 228 - 343 ) ÷ 343] x 100 = -33.53%
Formula
Percentage change = [(228 - 343) / 343] x 100
Subtract the new number by the original number
228 - 343 = -115
-115 ÷ 343 = -0.33527696793002915
-0.33527696793002915 x 100 = -33.53%