-51% is the change from 349 to 171
Calculation steps:
[( 171 - 349 ) ÷ 349] x 100 = -51%
Formula
Percentage change = [(171 - 349) / 349] x 100
Subtract the new number by the original number
171 - 349 = -178
-178 ÷ 349 = -0.5100286532951289
-0.5100286532951289 x 100 = -51%