Year	Number
1996	3.76344084739685
1998	3.74331545829773
2000	3.72340416908264
2002	3.17460322380066
2003	11.1111106872559
2004	25.1231517791748
2005	17.0731716156006
2006	36.5853652954102
2007	48.0582542419434
2008	52.4271850585938
2009	52.1531105041504
2010	61.4285697937012
2011	58.7677726745605
2012	64.9289093017578
2013	67.2985763549805
2014	68.75
2015	63.8095245361328
2016	64.2857131958008
2017	63.3333320617676
2018	61.9047622680664
2019	62.3809509277344
2020	61.4285697937012
2021	62.8571434020996
2022	62.7358474731445