0.5% is the change from 397 to 399
Calculation steps:
[( 399 - 397 ) ÷ 397] x 100 = 0.5%
Formula
Percentage change = [(399 - 397) / 397] x 100
Subtract the new number by the original number
399 - 397 = 2
2 ÷ 397 = 0.005037783375314861
0.005037783375314861 x 100 = 0.5%