Year	Number
1996	12.5
1998	8.95522403717041
2000	9.95024871826172
2002	10.945273399353
2003	9.95024871826172
2004	13.942307472229
2005	10.5769233703613
2006	12.0192308425903
2007	10.5769233703613
2008	12.5
2009	13.2701425552368
2010	13.2701425552368
2011	12.6760559082031
2012	14.5539903640747
2013	14.5539903640747
2014	15.7635469436646
2015	16.2561569213867
2016	13.3004922866821
2017	13.3004922866821
2018	12.1359224319458
2019	11.5942029953003
2020	10.6280193328857
2021	12.5603866577148
2022	11.5942029953003