31.16% is the change from 491 to 644
Calculation steps:
[( 644 - 491 ) ÷ 491] x 100 = 31.16%
Formula
Percentage change = [(644 - 491) / 491] x 100
Subtract the new number by the original number
644 - 491 = 153
153 ÷ 491 = 0.31160896130346233
0.31160896130346233 x 100 = 31.16%