Year	Number
1996	13.6612024307251
1998	22.9508190155029
2000	22.9508190155029
2002	18.3783779144287
2003	22.1621627807617
2004	23.3830852508545
2005	17.6470584869385
2006	17.5609760284424
2007	20.3883495330811
2008	21.3592224121094
2009	21.0526313781738
2010	20.0956935882568
2011	19.4312801361084
2012	20.8530807495117
2013	19.9052124023438
2014	20.1923084259033
2015	20.4761905670166
2016	20.9523811340332
2017	19.0476188659668
2018	18.0952377319336
2019	17.1428565979004
2020	17.1428565979004
2021	16.1904754638672
2022	18.8679237365723