-77.78% is the change from 171 to 38
Calculation steps:
[( 38 - 171 ) ÷ 171] x 100 = -77.78%
Formula
Percentage change = [(38 - 171) / 171] x 100
Subtract the new number by the original number
38 - 171 = -133
-133 ÷ 171 = -0.7777777777777778
-0.7777777777777778 x 100 = -77.78%