-31.92% is the change from 307 to 209
Calculation steps:
[( 209 - 307 ) ÷ 307] x 100 = -31.92%
Formula
Percentage change = [(209 - 307) / 307] x 100
Subtract the new number by the original number
209 - 307 = -98
-98 ÷ 307 = -0.31921824104234525
-0.31921824104234525 x 100 = -31.92%