Year	Number
1996	6.01092910766602
1998	7.10382509231567
2000	4.9180326461792
2002	7.02702713012695
2003	10.2702703475952
2004	10.4477615356445
2005	10.2941179275513
2006	8.29268264770508
2007	10.1941747665405
2008	12.62135887146
2009	11.4832534790039
2010	9.09090900421143
2011	9.95260620117188
2012	9.95260620117188
2013	10.9004735946655
2014	13.942307472229
2015	12.380952835083
2016	11.9047622680664
2017	11.9047622680664
2018	11.4285717010498
2019	10.9523811340332
2020	10
2021	10.9523811340332
2022	10.8490562438965