-37.32% is the change from 343 to 215
Calculation steps:
[( 215 - 343 ) ÷ 343] x 100 = -37.32%
Formula
Percentage change = [(215 - 343) / 343] x 100
Subtract the new number by the original number
215 - 343 = -128
-128 ÷ 343 = -0.37317784256559766
-0.37317784256559766 x 100 = -37.32%