Year	Number
1996	13.5678396224976
1998	13
2000	16.4179096221924
2002	12.4378108978271
2003	13.4328355789185
2004	10.5769233703613
2005	10.0478467941284
2006	10.0478467941284
2007	11.9617223739624
2008	11.057692527771
2009	13.2701425552368
2010	12.3222751617432
2011	14.5539903640747
2012	16.4319248199463
2013	15.962441444397
2014	15.865385055542
2015	14.2857141494751
2016	12.380952835083
2017	13.3333330154419
2018	11.4285717010498
2019	17.619047164917
2020	17.1428565979004
2021	19.5238094329834
2022	21.2264156341553