Year	Number
1996	16.3043479919434
1998	18.4782600402832
2000	22.8260860443115
2002	27.027027130127
2003	23.2432441711426
2004	21.8905467987061
2005	21.5686283111572
2006	21.5686283111572
2007	22.3300971984863
2008	24.2718448638916
2009	26.7942581176758
2010	26.7942581176758
2011	30.8056869506836
2012	35.0710906982422
2013	31.7535552978516
2014	31.730770111084
2015	26.1904754638672
2016	24.2857151031494
2017	27.619047164917
2018	24.2857151031494
2019	19.0476188659668
2020	18.5714282989502
2021	19.0476188659668
2022	18.8679237365723