-13.59% is the change from 309 to 267
Calculation steps:
[( 267 - 309 ) ÷ 309] x 100 = -13.59%
Formula
Percentage change = [(267 - 309) / 309] x 100
Subtract the new number by the original number
267 - 309 = -42
-42 ÷ 309 = -0.13592233009708737
-0.13592233009708737 x 100 = -13.59%