Year	Number
1996	13.0653266906738
1998	16.5
2000	16.9154224395752
2002	22.8855724334717
2003	24.8756217956543
2004	25
2005	26.7942581176758
2006	19.1387557983398
2007	15.7894735336304
2008	18.75
2009	15.1658763885498
2010	11.8483409881592
2011	16.4319248199463
2012	16.9014091491699
2013	20.1877937316895
2014	26.4423084259033
2015	18.5714282989502
2016	14.7619047164917
2017	10.4761905670166
2018	9.5238094329834
2019	11.9047622680664
2020	16.1904754638672
2021	11.9047622680664
2022	17.4528293609619