Year	Number
1996	19.0954780578613
1998	19.5
2000	21.8905467987061
2002	32.3383102416992
2003	26.8656711578369
2004	17.7884616851807
2005	13.8755979537964
2006	11.4832534790039
2007	11.0047845840454
2008	8.65384578704834
2009	7.5829381942749
2010	8.53080558776855
2011	9.85915470123291
2012	9.38967132568359
2013	11.7370891571045
2014	10.0961542129517
2015	15.7142858505249
2016	17.1428565979004
2017	15.2380952835083
2018	16.6666660308838
2019	16.1904754638672
2020	14.2857141494751
2021	18.5714282989502
2022	21.2264156341553