-15.93% is the change from 609 to 512
Calculation steps:
[( 512 - 609 ) ÷ 609] x 100 = -15.93%
Formula
Percentage change = [(512 - 609) / 609] x 100
Subtract the new number by the original number
512 - 609 = -97
-97 ÷ 609 = -0.1592775041050903
-0.1592775041050903 x 100 = -15.93%