-2.3% is the change from 651 to 636
Calculation steps:
[( 636 - 651 ) ÷ 651] x 100 = -2.3%
Formula
Percentage change = [(636 - 651) / 651] x 100
Subtract the new number by the original number
636 - 651 = -15
-15 ÷ 651 = -0.02304147465437788
-0.02304147465437788 x 100 = -2.3%