Year	Number
1996	17.0854263305664
1998	18
2000	17.9104480743408
2002	9.95024871826172
2003	6.96517419815063
2004	9.13461494445801
2005	11.4832534790039
2006	15.7894735336304
2007	18.6602878570557
2008	21.1538467407227
2009	15.1658763885498
2010	16.5876770019531
2011	16.4319248199463
2012	23.0046939849854
2013	23.9436626434326
2014	25.480770111084
2015	22.380952835083
2016	20.9523811340332
2017	18.5714282989502
2018	19.5238094329834
2019	17.1428565979004
2020	20
2021	26.6666660308838
2022	23.5849056243896