Year	Number
1996	19.5652179718018
1998	20.6521739959717
2000	14.6739130020142
2002	21.0810813903809
2003	15.1351346969604
2004	7.46268653869629
2005	11.2745094299316
2006	10.7843141555786
2007	11.6504850387573
2008	10.6796112060547
2009	8.13397121429443
2010	10.0478467941284
2011	11.3744077682495
2012	14.2180099487305
2013	15.6398105621338
2014	18.75
2015	23.8095245361328
2016	26.6666660308838
2017	27.619047164917
2018	32.8571434020996
2019	30.4761905670166
2020	30
2021	32.8571434020996
2022	35.8490562438965