Year	Number
1996	7.44680833816528
1998	10.638298034668
2000	14.8148145675659
2002	15.8730154037476
2003	21.608039855957
2004	20.3883495330811
2005	26.2135925292969
2006	26.0869560241699
2007	23.6714973449707
2008	15.865385055542
2009	19.9052124023438
2010	13.2701425552368
2011	15.6398105621338
2012	18.0094795227051
2013	18.4834117889404
2014	8.09523773193359
2015	9.0476188659668
2016	9.0476188659668
2017	8.5714282989502
2018	6.60377359390259
2019	4.24528312683105
2020	4.24528312683105
2021	6.13207530975342
2022	8.01886749267578