Year	Number
1996	3.76344084739685
1998	1.06951868534088
2000	0.531914889812469
2002	5.8201060295105
2003	8.99470901489258
2004	15.7635469436646
2005	22.9268283843994
2006	25.8536586761475
2007	28.6407775878906
2008	21.8446598052979
2009	18.6602878570557
2010	18.0952377319336
2011	19.4312801361084
2012	13.2701425552368
2013	14.2180099487305
2014	15.384614944458
2015	17.619047164917
2016	16.1904754638672
2017	18.0952377319336
2018	16.6666660308838
2019	17.1428565979004
2020	16.1904754638672
2021	12.8571424484253
2022	14.1509437561035