-6.4% is the change from 172 to 161
Calculation steps:
[( 161 - 172 ) ÷ 172] x 100 = -6.4%
Formula
Percentage change = [(161 - 172) / 172] x 100
Subtract the new number by the original number
161 - 172 = -11
-11 ÷ 172 = -0.06395348837209303
-0.06395348837209303 x 100 = -6.4%