Answer:
in 2009, there were about 3.3 mil visitors, 2010 having 3.64 mil.
3.3 + 3.64 = 6.94
Explanation:
In 2011 there were 3.39 million visitors and 2012 had 3.45
3.39 + 3.45 = 6.84
6.94 - 6.84 = 0.1
Therefore, there were 0.1 million more visitors in 2011 and '12 than 2009 and '10.
hopes this helps :)