-71% is the change from 100 to 29
Calculation steps:
[( 29 - 100 ) ÷ 100] x 100 = -71%
Formula
Percentage change = [(29 - 100) / 100] x 100
Subtract the new number by the original number
29 - 100 = -71
-71 ÷ 100 = -0.71
-0.71 x 100 = -71%
Example