-2.78% is the change from 683 to 664
Calculation steps:
[( 664 - 683 ) ÷ 683] x 100 = -2.78%
Formula
Percentage change = [(664 - 683) / 683] x 100
Subtract the new number by the original number
664 - 683 = -19
-19 ÷ 683 = -0.027818448023426062
-0.027818448023426062 x 100 = -2.78%