Year	Number
1996	22.4043712615967
1998	25.1366119384766
2000	19.6721305847168
2002	20.5405406951904
2003	21.0810813903809
2004	9.95024871826172
2005	12.7450981140137
2006	15.6097564697266
2007	16.019416809082
2008	15.0485439300537
2009	13.8755979537964
2010	13.8755979537964
2011	14.2180099487305
2012	11.8483409881592
2013	14.2180099487305
2014	13.942307472229
2015	12.380952835083
2016	14.7619047164917
2017	13.8095235824585
2018	13.3333330154419
2019	12.8571424484253
2020	11.9047622680664
2021	10.9523811340332
2022	8.96226406097412