Year	Number
1996	14
1998	13.4328355789185
2000	12.93532371521
2002	13.4328355789185
2003	10.945273399353
2004	18.75
2005	19.230770111084
2006	28.8461532592773
2007	21.1538467407227
2008	15.384614944458
2009	13.2701425552368
2010	15.6398105621338
2011	12.6760559082031
2012	14.5539903640747
2013	15.023473739624
2014	14.7783250808716
2015	13.3004922866821
2016	11.3300495147705
2017	12.3152713775635
2018	15.0485439300537
2019	13.5265703201294
2020	11.1111106872559
2021	12.5603866577148
2022	13.043478012085