Year	Number
2000	16.95893
2001	17.31881
2002	17.48617
2003	17.09607
2004	16.33875
2005	16.16185
2006	15.87323
2007	16.32016
2008	15.25295
2009	13.0384
2010	11.58301
2011	12.34803
2012	12.68218
2013	11.51109