-30.75% is the change from 930 to 644
Calculation steps:
[( 644 - 930 ) ÷ 930] x 100 = -30.75%
Formula
Percentage change = [(644 - 930) / 930] x 100
Subtract the new number by the original number
644 - 930 = -286
-286 ÷ 930 = -0.30752688172043013
-0.30752688172043013 x 100 = -30.75%