Year	Number
1996	15.0537633895874
1998	21.3903751373291
2000	20.2127666473389
2002	20.6349201202393
2003	25.3968257904053
2004	23.645320892334
2005	21.463415145874
2006	19.0243911743164
2007	16.5048542022705
2008	12.1359224319458
2009	11.0047845840454
2010	13.3333330154419
2011	15.6398105621338
2012	15.1658763885498
2013	15.6398105621338
2014	17.3076915740967
2015	15.7142858505249
2016	21.4285717010498
2017	16.6666660308838
2018	19.5238094329834
2019	23.8095245361328
2020	19.0476188659668
2021	19.5238094329834
2022	19.3396224975586