-2.87% is the change from 663 to 644
Calculation steps:
[( 644 - 663 ) ÷ 663] x 100 = -2.87%
Formula
Percentage change = [(644 - 663) / 663] x 100
Subtract the new number by the original number
644 - 663 = -19
-19 ÷ 663 = -0.02865761689291101
-0.02865761689291101 x 100 = -2.87%