-50.15% is the change from 646 to 322
Calculation steps:
[( 322 - 646 ) ÷ 646] x 100 = -50.15%
Formula
Percentage change = [(322 - 646) / 646] x 100
Subtract the new number by the original number
322 - 646 = -324
-324 ÷ 646 = -0.5015479876160991
-0.5015479876160991 x 100 = -50.15%