Year	Number
1996	52.1276588439941
1998	36.7021293640137
2000	23.280424118042
2002	19.0476188659668
2003	27.6381912231445
2004	22.3300971984863
2005	22.8155345916748
2006	29.468599319458
2007	23.6714973449707
2008	18.75
2009	20.8530807495117
2010	24.1706161499023
2011	29.3838863372803
2012	33.6492881774902
2013	36.4928894042969
2014	30
2015	35.7142868041992
2016	35.7142868041992
2017	31.9047622680664
2018	33.0188674926758
2019	24.5283012390137
2020	21.698112487793
2021	25
2022	27.3584899902344