-97.37% is the change from 647 to 17
Calculation steps:
[( 17 - 647 ) ÷ 647] x 100 = -97.37%
Formula
Percentage change = [(17 - 647) / 647] x 100
Subtract the new number by the original number
17 - 647 = -630
-630 ÷ 647 = -0.973724884080371
-0.973724884080371 x 100 = -97.37%