Year	Number
1996	2.12765955924988
1998	7.44680833816528
2000	5.29100513458252
2002	2.64550256729126
2003	3.01507544517517
2004	4.36893224716187
2005	3.88349509239197
2006	8.21256065368652
2007	10.6280193328857
2008	12.0192308425903
2009	9.95260620117188
2010	9.95260620117188
2011	9.95260620117188
2012	12.3222751617432
2013	12.3222751617432
2014	9.0476188659668
2015	10.9523811340332
2016	13.3333330154419
2017	15.2380952835083
2018	13.2075471878052
2019	12.7358493804932
2020	11.3207550048828
2021	10.3773584365845
2022	12.2641506195068