-17.62% is the change from 261 to 215
Calculation steps:
[( 215 - 261 ) ÷ 261] x 100 = -17.62%
Formula
Percentage change = [(215 - 261) / 261] x 100
Subtract the new number by the original number
215 - 261 = -46
-46 ÷ 261 = -0.17624521072796934
-0.17624521072796934 x 100 = -17.62%