-0.29% is the change from 690 to 688
Calculation steps:
[( 688 - 690 ) ÷ 690] x 100 = -0.29%
Formula
Percentage change = [(688 - 690) / 690] x 100
Subtract the new number by the original number
688 - 690 = -2
-2 ÷ 690 = -0.002898550724637681
-0.002898550724637681 x 100 = -0.29%