-8.6% is the change from 186 to 170
Calculation steps:
[( 170 - 186 ) ÷ 186] x 100 = -8.6%
Formula
Percentage change = [(170 - 186) / 186] x 100
Subtract the new number by the original number
170 - 186 = -16
-16 ÷ 186 = -0.08602150537634409
-0.08602150537634409 x 100 = -8.6%