2.16% is the change from 510 to 521
Calculation steps:
[( 521 - 510 ) ÷ 510] x 100 = 2.16%
Formula
Percentage change = [(521 - 510) / 510] x 100
Subtract the new number by the original number
521 - 510 = 11
11 ÷ 510 = 0.021568627450980392
0.021568627450980392 x 100 = 2.16%