Year	Number
1996	10.3260869979858
1998	13.043478012085
2000	11.956521987915
2002	15.1351346969604
2003	16.2162170410156
2004	20.3980102539063
2005	11.2745094299316
2006	15.1960783004761
2007	14.0776700973511
2008	12.1359224319458
2009	13.3971290588379
2010	14.3540668487549
2011	15.1658763885498
2012	13.7440757751465
2013	16.5876770019531
2014	10.0961542129517
2015	9.5238094329834
2016	10.4761905670166
2017	9.5238094329834
2018	10.9523811340332
2019	10
2020	10.9523811340332
2021	10.4761905670166
2022	12.7358493804932