Year	Number
1996	24.1206035614014
1998	22
2000	15.4228858947754
2002	10.4477615356445
2003	15.9203977584839
2004	12.5
2005	11.9617223739624
2006	8.61244010925293
2007	11.4832534790039
2008	13.942307472229
2009	15.6398105621338
2010	14.2180099487305
2011	13.1455402374268
2012	19.7183094024658
2013	20.1877937316895
2014	21.1538467407227
2015	19.0476188659668
2016	24.2857151031494
2017	19.5238094329834
2018	19.0476188659668
2019	20.9523811340332
2020	14.2857141494751
2021	12.380952835083
2022	11.7924528121948