-33.64% is the change from 975 to 647
Calculation steps:
[( 647 - 975 ) ÷ 975] x 100 = -33.64%
Formula
Percentage change = [(647 - 975) / 975] x 100
Subtract the new number by the original number
647 - 975 = -328
-328 ÷ 975 = -0.3364102564102564
-0.3364102564102564 x 100 = -33.64%