Year	Number
1996	19.8924732208252
1998	27.807487487793
2000	23.9361705780029
2002	28.5714282989502
2003	23.280424118042
2004	21.1822662353516
2005	21.463415145874
2006	17.0731716156006
2007	16.019416809082
2008	15.0485439300537
2009	24.4019145965576
2010	20.9523811340332
2011	19.4312801361084
2012	22.748815536499
2013	21.8009471893311
2014	23.5576915740967
2015	22.380952835083
2016	21.4285717010498
2017	26.1904754638672
2018	26.1904754638672
2019	19.0476188659668
2020	16.1904754638672
2021	18.0952377319336
2022	19.8113212585449