Year	Number
1996	37.5
1998	35.3233833312988
2000	33.8308448791504
2002	22.3880596160889
2003	29.8507461547852
2004	25.480770111084
2005	24.0384616851807
2006	20.6730766296387
2007	22.115385055542
2008	18.269229888916
2009	15.1658763885498
2010	13.7440757751465
2011	13.6150236129761
2012	15.023473739624
2013	15.023473739624
2014	19.7044334411621
2015	12.8078813552856
2016	7.88177347183228
2017	7.88177347183228
2018	6.7961163520813
2019	6.7632851600647
2020	5.31400966644287
2021	10.1449279785156
2022	10.1449279785156