-3.32% is the change from 663 to 641
Calculation steps:
[( 641 - 663 ) ÷ 663] x 100 = -3.32%
Formula
Percentage change = [(641 - 663) / 663] x 100
Subtract the new number by the original number
641 - 663 = -22
-22 ÷ 663 = -0.033182503770739065
-0.033182503770739065 x 100 = -3.32%