-12.87% is the change from 171 to 149
Calculation steps:
[( 149 - 171 ) ÷ 171] x 100 = -12.87%
Formula
Percentage change = [(149 - 171) / 171] x 100
Subtract the new number by the original number
149 - 171 = -22
-22 ÷ 171 = -0.1286549707602339
-0.1286549707602339 x 100 = -12.87%