-2.72% is the change from 662 to 644
Calculation steps:
[( 644 - 662 ) ÷ 662] x 100 = -2.72%
Formula
Percentage change = [(644 - 662) / 662] x 100
Subtract the new number by the original number
644 - 662 = -18
-18 ÷ 662 = -0.027190332326283987
-0.027190332326283987 x 100 = -2.72%