Year	Number
2001	13.20372
2003	14.11461
2005	11.63705
2006	11.46444
2007	11.15369
2008	11.04127
2009	10.68059
2010	10.39489
2011	8.90961
2012	8.66085
2013	9.5332
2014	9.45976
2015	9.3184
2016	9.19768
2017	9.09854