Year	Number
1996	6.01092910766602
1998	6.01092910766602
2000	4.37158489227295
2002	16.7567558288574
2003	16.2162170410156
2004	20.3980102539063
2005	26.470588684082
2006	27.3170738220215
2007	18.4466018676758
2008	16.990291595459
2009	20.5741634368896
2010	25.3588523864746
2011	19.9052124023438
2012	23.6966819763184
2013	25.1184825897217
2014	25
2015	24.761905670166
2016	21.9047622680664
2017	18.5714282989502
2018	19.0476188659668
2019	15.2380952835083
2020	16.1904754638672
2021	12.8571424484253
2022	15.5660381317139