Year	Number
1996	30.1075267791748
1998	28.3422451019287
2000	27.659574508667
2002	23.8095245361328
2003	29.100528717041
2004	27.0935955047607
2005	25.3658542633057
2006	24.3902435302734
2007	26.6990299224854
2008	31.0679607391357
2009	24.8803825378418
2010	26.1904754638672
2011	28.9099521636963
2012	36.9668235778809
2013	37.4407577514648
2014	27.4038467407227
2015	29.0476188659668
2016	28.5714282989502
2017	30.9523811340332
2018	29.5238094329834
2019	34.761905670166
2020	33.8095245361328
2021	30
2022	29.7169818878174