Year	Number
1996	17.5879402160645
1998	23.5
2000	30.8457717895508
2002	33.8308448791504
2003	29.3532333374023
2004	31.25
2005	32.0574150085449
2006	27.2727279663086
2007	24.4019145965576
2008	19.230770111084
2009	24.6445503234863
2010	26.5402851104736
2011	25.8215961456299
2012	26.7605628967285
2013	24.4131450653076
2014	29.3269233703613
2015	28.5714282989502
2016	19.0476188659668
2017	20.9523811340332
2018	19.0476188659668
2019	19.0476188659668
2020	19.0476188659668
2021	15.2380952835083
2022	12.7358493804932