Year	Number
1996	18.5
1998	6.96517419815063
2000	3.48258709907532
2002	23.3830852508545
2003	29.8507461547852
2004	29.8076915740967
2005	24.0384616851807
2006	31.25
2007	34.1346168518066
2008	35.0961532592773
2009	34.1232223510742
2010	35.5450248718262
2011	34.2723007202148
2012	30.9859161376953
2013	30.5164318084717
2014	31.5270938873291
2015	30.5418720245361
2016	34.4827575683594
2017	34.4827575683594
2018	33.009708404541
2019	34.7826080322266
2020	37.1980667114258
2021	36.7149772644043
2022	37.1980667114258