-26.41% is the change from 231 to 170
Calculation steps:
[( 170 - 231 ) ÷ 231] x 100 = -26.41%
Formula
Percentage change = [(170 - 231) / 231] x 100
Subtract the new number by the original number
170 - 231 = -61
-61 ÷ 231 = -0.26406926406926406
-0.26406926406926406 x 100 = -26.41%