Year	Number
1996	31.1557788848877
1998	17.5
2000	23.8805961608887
2002	19.9004974365234
2003	19.9004974365234
2004	26.9230766296387
2005	26.7942581176758
2006	26.7942581176758
2007	27.2727279663086
2008	31.25
2009	33.6492881774902
2010	33.6492881774902
2011	33.8028182983398
2012	42.7230033874512
2013	43.6619720458984
2014	41.8269233703613
2015	36.6666679382324
2016	34.2857131958008
2017	34.2857131958008
2018	33.8095245361328
2019	34.761905670166
2020	31.4285717010498
2021	31.9047622680664
2022	30.1886787414551