Year	Number
1996	2.12765955924988
1998	0
2000	17.4603176116943
2002	12.6984128952026
2003	19.0954780578613
2004	18.9320392608643
2005	16.5048542022705
2006	16.425121307373
2007	16.9082126617432
2008	12.5
2009	14.2180099487305
2010	12.3222751617432
2011	11.3744077682495
2012	7.5829381942749
2013	8.05687236785889
2014	11.9047622680664
2015	17.619047164917
2016	17.1428565979004
2017	16.1904754638672
2018	12.7358493804932
2019	13.6792449951172
2020	12.2641506195068
2021	20.2830181121826
2022	16.9811325073242