-21.86% is the change from 215 to 168
Calculation steps:
[( 168 - 215 ) ÷ 215] x 100 = -21.86%
Formula
Percentage change = [(168 - 215) / 215] x 100
Subtract the new number by the original number
168 - 215 = -47
-47 ÷ 215 = -0.2186046511627907
-0.2186046511627907 x 100 = -21.86%