-13.92% is the change from 309 to 266
Calculation steps:
[( 266 - 309 ) ÷ 309] x 100 = -13.92%
Formula
Percentage change = [(266 - 309) / 309] x 100
Subtract the new number by the original number
266 - 309 = -43
-43 ÷ 309 = -0.13915857605177995
-0.13915857605177995 x 100 = -13.92%