Year	Number
1996	23.3695659637451
1998	22.8260860443115
2000	24.456521987915
2002	29.1891899108887
2003	21.6216220855713
2004	20.3980102539063
2005	22.5490188598633
2006	18.6274509429932
2007	21.8446598052979
2008	22.8155345916748
2009	23.9234447479248
2010	24.4019145965576
2011	21.8009471893311
2012	28.9099521636963
2013	28.9099521636963
2014	25.480770111084
2015	21.9047622680664
2016	21.4285717010498
2017	19.0476188659668
2018	17.1428565979004
2019	15.2380952835083
2020	13.3333330154419
2021	12.8571424484253
2022	15.5660381317139