-37.65% is the change from 340 to 212
Calculation steps:
[( 212 - 340 ) ÷ 340] x 100 = -37.65%
Formula
Percentage change = [(212 - 340) / 340] x 100
Subtract the new number by the original number
212 - 340 = -128
-128 ÷ 340 = -0.3764705882352941
-0.3764705882352941 x 100 = -37.65%