-2.42% is the change from 662 to 646
Calculation steps:
[( 646 - 662 ) ÷ 662] x 100 = -2.42%
Formula
Percentage change = [(646 - 662) / 662] x 100
Subtract the new number by the original number
646 - 662 = -16
-16 ÷ 662 = -0.02416918429003021
-0.02416918429003021 x 100 = -2.42%