-51.63% is the change from 643 to 311
Calculation steps:
[( 311 - 643 ) ÷ 643] x 100 = -51.63%
Formula
Percentage change = [(311 - 643) / 643] x 100
Subtract the new number by the original number
311 - 643 = -332
-332 ÷ 643 = -0.5163297045101088
-0.5163297045101088 x 100 = -51.63%