-38.43% is the change from 497 to 306
Calculation steps:
[( 306 - 497 ) ÷ 497] x 100 = -38.43%
Formula
Percentage change = [(306 - 497) / 497] x 100
Subtract the new number by the original number
306 - 497 = -191
-191 ÷ 497 = -0.3843058350100604
-0.3843058350100604 x 100 = -38.43%