Year	Number
1996	17.2043018341064
1998	19.786096572876
2000	18.0851058959961
2002	22.7513236999512
2003	26.4550266265869
2004	19.7044334411621
2005	22.4390239715576
2006	20.4878044128418
2007	19.4174766540527
2008	17.9611644744873
2009	18.1818180084229
2010	16.1904754638672
2011	17.5355453491211
2012	18.9573459625244
2013	26.0663509368896
2014	24.0384616851807
2015	26.1904754638672
2016	31.9047622680664
2017	27.1428565979004
2018	29.5238094329834
2019	30.9523811340332
2020	23.8095245361328
2021	33.3333320617676
2022	24.5283012390137