-2.2% is the change from 683 to 668
Calculation steps:
[( 668 - 683 ) ÷ 683] x 100 = -2.2%
Formula
Percentage change = [(668 - 683) / 683] x 100
Subtract the new number by the original number
668 - 683 = -15
-15 ÷ 683 = -0.021961932650073207
-0.021961932650073207 x 100 = -2.2%