2.15% is the change from 978 to 999
Calculation steps:
[( 999 - 978 ) ÷ 978] x 100 = 2.15%
Formula
Percentage change = [(999 - 978) / 978] x 100
Subtract the new number by the original number
999 - 978 = 21
21 ÷ 978 = 0.02147239263803681
0.02147239263803681 x 100 = 2.15%