Year	Number
1996	17.5879402160645
1998	18.5
2000	26.3681583404541
2002	19.9004974365234
2003	16.9154224395752
2004	13.942307472229
2005	16.2679424285889
2006	14.3540668487549
2007	16.7464122772217
2008	5.76923084259033
2009	15.1658763885498
2010	12.3222751617432
2011	12.2065725326538
2012	9.38967132568359
2013	9.85915470123291
2014	10.5769233703613
2015	11.4285717010498
2016	15.2380952835083
2017	20
2018	16.6666660308838
2019	20
2020	20.4761905670166
2021	18.0952377319336
2022	19.8113212585449