-9.28% is the change from 237 to 215
Calculation steps:
[( 215 - 237 ) ÷ 237] x 100 = -9.28%
Formula
Percentage change = [(215 - 237) / 237] x 100
Subtract the new number by the original number
215 - 237 = -22
-22 ÷ 237 = -0.09282700421940929
-0.09282700421940929 x 100 = -9.28%