-33.01% is the change from 309 to 207
Calculation steps:
[( 207 - 309 ) ÷ 309] x 100 = -33.01%
Formula
Percentage change = [(207 - 309) / 309] x 100
Subtract the new number by the original number
207 - 309 = -102
-102 ÷ 309 = -0.3300970873786408
-0.3300970873786408 x 100 = -33.01%