9.71% is the change from 587 to 644
Calculation steps:
[( 644 - 587 ) ÷ 587] x 100 = 9.71%
Formula
Percentage change = [(644 - 587) / 587] x 100
Subtract the new number by the original number
644 - 587 = 57
57 ÷ 587 = 0.09710391822827939
0.09710391822827939 x 100 = 9.71%