-1.38% is the change from 218 to 215
Calculation steps:
[( 215 - 218 ) ÷ 218] x 100 = -1.38%
Formula
Percentage change = [(215 - 218) / 218] x 100
Subtract the new number by the original number
215 - 218 = -3
-3 ÷ 218 = -0.013761467889908258
-0.013761467889908258 x 100 = -1.38%