-9.8% is the change from 643 to 580
Calculation steps:
[( 580 - 643 ) ÷ 643] x 100 = -9.8%
Formula
Percentage change = [(580 - 643) / 643] x 100
Subtract the new number by the original number
580 - 643 = -63
-63 ÷ 643 = -0.09797822706065319
-0.09797822706065319 x 100 = -9.8%