Year	Number
1996	13.5869569778442
1998	16.8478260040283
2000	16.3043479919434
2002	16.7567558288574
2003	18.9189186096191
2004	20.3980102539063
2005	22.5490188598633
2006	22.5490188598633
2007	25.2427177429199
2008	26.2135925292969
2009	26.3157901763916
2010	26.3157901763916
2011	27.962085723877
2012	26.0663509368896
2013	23.222749710083
2014	17.3076915740967
2015	18.0952377319336
2016	17.1428565979004
2017	16.1904754638672
2018	16.6666660308838
2019	16.6666660308838
2020	14.7619047164917
2021	18.0952377319336
2022	17.9245281219482