-0.22% is the change from 921 to 919
Calculation steps:
[( 919 - 921 ) ÷ 921] x 100 = -0.22%
Formula
Percentage change = [(919 - 921) / 921] x 100
Subtract the new number by the original number
919 - 921 = -2
-2 ÷ 921 = -0.002171552660152009
-0.002171552660152009 x 100 = -0.22%