-37.94% is the change from 340 to 211
Calculation steps:
[( 211 - 340 ) ÷ 340] x 100 = -37.94%
Formula
Percentage change = [(211 - 340) / 340] x 100
Subtract the new number by the original number
211 - 340 = -129
-129 ÷ 340 = -0.37941176470588234
-0.37941176470588234 x 100 = -37.94%