Year	Number
1996	26.5
1998	21.8905467987061
2000	21.3930339813232
2002	9.45273590087891
2003	8.95522403717041
2004	12.5
2005	8.65384578704834
2006	7.692307472229
2007	8.17307662963867
2008	7.692307472229
2009	7.5829381942749
2010	7.5829381942749
2011	7.51173686981201
2012	7.51173686981201
2013	8.45070457458496
2014	6.40394067764282
2015	7.38916254043579
2016	7.88177347183228
2017	7.38916254043579
2018	6.7961163520813
2019	6.7632851600647
2020	5.31400966644287
2021	10.1449279785156
2022	9.66183567047119