The values are given asÂ
2005 2.63Â
2006 3.26Â
2007 3.54Â
2008 3.769Â
2009 2.13Â
2010 2.956Â
2011 4.259Â
2012 4.16Â
2013 3.78Â
2014 3.99Â
2015 3.10
where left side is the year (x) and right side is the value (y)
The smallest value of y is = 2.13; biggest value is = 4.259 (RANGE)
Domain is (2003 to 2015)
It seems that the equation will not be linear because as the year increases, the value of y is unstable.