-69.9% is the change from 309 to 93
Calculation steps:
[( 93 - 309 ) ÷ 309] x 100 = -69.9%
Formula
Percentage change = [(93 - 309) / 309] x 100
Subtract the new number by the original number
93 - 309 = -216
-216 ÷ 309 = -0.6990291262135923
-0.6990291262135923 x 100 = -69.9%