Year	Number
1996	16.582914352417
1998	13.5
2000	8.95522403717041
2002	13.4328355789185
2003	10.945273399353
2004	13.4615383148193
2005	10.5263156890869
2006	10.0478467941284
2007	9.09090900421143
2008	8.65384578704834
2009	15.1658763885498
2010	15.1658763885498
2011	17.3708915710449
2012	14.0845069885254
2013	15.023473739624
2014	13.942307472229
2015	12.380952835083
2016	11.9047622680664
2017	12.380952835083
2018	14.7619047164917
2019	16.1904754638672
2020	16.1904754638672
2021	11.9047622680664
2022	6.13207530975342