Year	Number
1996	7.5268816947937
1998	13.3689842224121
2000	22.8723411560059
2002	20.1058197021484
2003	24.3386249542236
2004	10.837438583374
2005	14.6341466903687
2006	22.4390239715576
2007	21.8446598052979
2008	19.4174766540527
2009	13.8755979537964
2010	13.8095235824585
2011	15.1658763885498
2012	14.2180099487305
2013	17.0616111755371
2014	23.0769233703613
2015	22.380952835083
2016	17.619047164917
2017	21.9047622680664
2018	24.2857151031494
2019	20.9523811340332
2020	21.9047622680664
2021	23.3333339691162
2022	22.6415100097656