30.11% is the change from 631 to 821
Calculation steps:
[( 821 - 631 ) ÷ 631] x 100 = 30.11%
Formula
Percentage change = [(821 - 631) / 631] x 100
Subtract the new number by the original number
821 - 631 = 190
190 ÷ 631 = 0.3011093502377179
0.3011093502377179 x 100 = 30.11%