-67.84% is the change from 171 to 55
Calculation steps:
[( 55 - 171 ) ÷ 171] x 100 = -67.84%
Formula
Percentage change = [(55 - 171) / 171] x 100
Subtract the new number by the original number
55 - 171 = -116
-116 ÷ 171 = -0.6783625730994152
-0.6783625730994152 x 100 = -67.84%