Year	Number
1999	15.59241
2000	15.25432
2001	15.05386
2002	15.049
2003	14.90022
2004	14.55741
2005	14.1753
2006	14.361
2007	14.46225
2008	13.0991
2009	13.45208
2010	13.80075
2011	13.97348
2012	15.09369