-49.1% is the change from 609 to 310
Calculation steps:
[( 310 - 609 ) ÷ 609] x 100 = -49.1%
Formula
Percentage change = [(310 - 609) / 609] x 100
Subtract the new number by the original number
310 - 609 = -299
-299 ÷ 609 = -0.4909688013136289
-0.4909688013136289 x 100 = -49.1%