Year	Number
1996	18.032787322998
1998	9.8360652923584
2000	16.9398899078369
2002	15.1351346969604
2003	20.5405406951904
2004	17.412935256958
2005	20.5882358551025
2006	18.0487804412842
2007	16.019416809082
2008	16.990291595459
2009	8.61244010925293
2010	10.0478467941284
2011	12.7962083816528
2012	15.6398105621338
2013	15.6398105621338
2014	11.5384616851807
2015	15.2380952835083
2016	11.4285717010498
2017	13.8095235824585
2018	11.9047622680664
2019	9.5238094329834
2020	11.9047622680664
2021	13.3333330154419
2022	14.1509437561035