-34.98% is the change from 989 to 643
Calculation steps:
[( 643 - 989 ) ÷ 989] x 100 = -34.98%
Formula
Percentage change = [(643 - 989) / 989] x 100
Subtract the new number by the original number
643 - 989 = -346
-346 ÷ 989 = -0.34984833164812945
-0.34984833164812945 x 100 = -34.98%