-25.12% is the change from 215 to 161
Calculation steps:
[( 161 - 215 ) ÷ 215] x 100 = -25.12%
Formula
Percentage change = [(161 - 215) / 215] x 100
Subtract the new number by the original number
161 - 215 = -54
-54 ÷ 215 = -0.25116279069767444
-0.25116279069767444 x 100 = -25.12%