-2.47% is the change from 688 to 671
Calculation steps:
[( 671 - 688 ) ÷ 688] x 100 = -2.47%
Formula
Percentage change = [(671 - 688) / 688] x 100
Subtract the new number by the original number
671 - 688 = -17
-17 ÷ 688 = -0.024709302325581394
-0.024709302325581394 x 100 = -2.47%