-6.3% is the change from 683 to 640
Calculation steps:
[( 640 - 683 ) ÷ 683] x 100 = -6.3%
Formula
Percentage change = [(640 - 683) / 683] x 100
Subtract the new number by the original number
640 - 683 = -43
-43 ÷ 683 = -0.0629575402635432
-0.0629575402635432 x 100 = -6.3%