-34.72% is the change from 985 to 643
Calculation steps:
[( 643 - 985 ) ÷ 985] x 100 = -34.72%
Formula
Percentage change = [(643 - 985) / 985] x 100
Subtract the new number by the original number
643 - 985 = -342
-342 ÷ 985 = -0.3472081218274112
-0.3472081218274112 x 100 = -34.72%