-6.45% is the change from 651 to 609
Calculation steps:
[( 609 - 651 ) ÷ 651] x 100 = -6.45%
Formula
Percentage change = [(609 - 651) / 651] x 100
Subtract the new number by the original number
609 - 651 = -42
-42 ÷ 651 = -0.06451612903225806
-0.06451612903225806 x 100 = -6.45%