Year	Number
1996	23.6180896759033
1998	24.5
2000	27.3631839752197
2002	30.348258972168
2003	28.8557205200195
2004	31.25
2005	32.5358848571777
2006	31.5789470672607
2007	33.4928245544434
2008	33.1730766296387
2009	33.1753540039063
2010	36.9668235778809
2011	32.8638496398926
2012	33.3333320617676
2013	23.474178314209
2014	22.115385055542
2015	20.9523811340332
2016	12.8571424484253
2017	15.2380952835083
2018	14.2857141494751
2019	14.2857141494751
2020	14.7619047164917
2021	15.7142858505249
2022	16.5094337463379