-17% is the change from 647 to 537
Calculation steps:
[( 537 - 647 ) ÷ 647] x 100 = -17%
Formula
Percentage change = [(537 - 647) / 647] x 100
Subtract the new number by the original number
537 - 647 = -110
-110 ÷ 647 = -0.17001545595054096
-0.17001545595054096 x 100 = -17%