-95.79% is the change from 309 to 13
Calculation steps:
[( 13 - 309 ) ÷ 309] x 100 = -95.79%
Formula
Percentage change = [(13 - 309) / 309] x 100
Subtract the new number by the original number
13 - 309 = -296
-296 ÷ 309 = -0.9579288025889967
-0.9579288025889967 x 100 = -95.79%