-26.12% is the change from 291 to 215
Calculation steps:
[( 215 - 291 ) ÷ 291] x 100 = -26.12%
Formula
Percentage change = [(215 - 291) / 291] x 100
Subtract the new number by the original number
215 - 291 = -76
-76 ÷ 291 = -0.2611683848797251
-0.2611683848797251 x 100 = -26.12%