-9.57% is the change from 188 to 170
Calculation steps:
[( 170 - 188 ) ÷ 188] x 100 = -9.57%
Formula
Percentage change = [(170 - 188) / 188] x 100
Subtract the new number by the original number
170 - 188 = -18
-18 ÷ 188 = -0.09574468085106383
-0.09574468085106383 x 100 = -9.57%