-2.99% is the change from 669 to 649
Calculation steps:
[( 649 - 669 ) ÷ 669] x 100 = -2.99%
Formula
Percentage change = [(649 - 669) / 669] x 100
Subtract the new number by the original number
649 - 669 = -20
-20 ÷ 669 = -0.029895366218236172
-0.029895366218236172 x 100 = -2.99%