-86.51% is the change from 215 to 29
Calculation steps:
[( 29 - 215 ) ÷ 215] x 100 = -86.51%
Formula
Percentage change = [(29 - 215) / 215] x 100
Subtract the new number by the original number
29 - 215 = -186
-186 ÷ 215 = -0.8651162790697674
-0.8651162790697674 x 100 = -86.51%