-0.3% is the change from 663 to 661
Calculation steps:
[( 661 - 663 ) ÷ 663] x 100 = -0.3%
Formula
Percentage change = [(661 - 663) / 663] x 100
Subtract the new number by the original number
661 - 663 = -2
-2 ÷ 663 = -0.0030165912518853697
-0.0030165912518853697 x 100 = -0.3%