-3.21% is the change from 218 to 211
Calculation steps:
[( 211 - 218 ) ÷ 218] x 100 = -3.21%
Formula
Percentage change = [(211 - 218) / 218] x 100
Subtract the new number by the original number
211 - 218 = -7
-7 ÷ 218 = -0.03211009174311927
-0.03211009174311927 x 100 = -3.21%