-68.61% is the change from 309 to 97
Calculation steps:
[( 97 - 309 ) ÷ 309] x 100 = -68.61%
Formula
Percentage change = [(97 - 309) / 309] x 100
Subtract the new number by the original number
97 - 309 = -212
-212 ÷ 309 = -0.686084142394822
-0.686084142394822 x 100 = -68.61%