-33.92% is the change from 973 to 643
Calculation steps:
[( 643 - 973 ) ÷ 973] x 100 = -33.92%
Formula
Percentage change = [(643 - 973) / 973] x 100
Subtract the new number by the original number
643 - 973 = -330
-330 ÷ 973 = -0.3391572456320658
-0.3391572456320658 x 100 = -33.92%