Year	Number
1996	17.5879402160645
1998	17.5
2000	18.9054718017578
2002	16.9154224395752
2003	17.9104480743408
2004	8.17307662963867
2005	7.65550231933594
2006	7.17703342437744
2007	8.13397121429443
2008	9.61538505554199
2009	10.9004735946655
2010	9.47867298126221
2011	11.2676057815552
2012	9.85915470123291
2013	12.6760559082031
2014	11.057692527771
2015	10.4761905670166
2016	9.5238094329834
2017	9.5238094329834
2018	9.5238094329834
2019	10.9523811340332
2020	11.9047622680664
2021	10.9523811340332
2022	11.7924528121948