-47.4% is the change from 173 to 91
Calculation steps:
[( 91 - 173 ) ÷ 173] x 100 = -47.4%
Formula
Percentage change = [(91 - 173) / 173] x 100
Subtract the new number by the original number
91 - 173 = -82
-82 ÷ 173 = -0.47398843930635837
-0.47398843930635837 x 100 = -47.4%