51.09% is the change from 644 to 973
Calculation steps:
[( 973 - 644 ) ÷ 644] x 100 = 51.09%
Formula
Percentage change = [(973 - 644) / 644] x 100
Subtract the new number by the original number
973 - 644 = 329
329 ÷ 644 = 0.5108695652173914
0.5108695652173914 x 100 = 51.09%