-2.27% is the change from 662 to 647
Calculation steps:
[( 647 - 662 ) ÷ 662] x 100 = -2.27%
Formula
Percentage change = [(647 - 662) / 662] x 100
Subtract the new number by the original number
647 - 662 = -15
-15 ÷ 662 = -0.022658610271903322
-0.022658610271903322 x 100 = -2.27%