The growths are obtained by subtracting 2010 from 2013 figures. Although there are 4 years of figures there are only three periods of growth: 10 – 11, 12 – 12, 12, – 13.
Then find the compound growth over three years by taking the 1/3 root.
So ENT, Restaurants as an example: (62 – 54)/54 = 0.1481
A growth of x(1+g) has been applied so that sales of 1 woulld rise to 11481
(1.1481)^1/3 (ie the third root) = 1.047 = 1+g; g = 4.7%
Far too complicated. I would simply have divided by three to get an estimate of the growth.