Year	Number
1996	23.6559143066406
1998	11.2299461364746
2000	11.702127456665
2002	26.9841270446777
2003	10.582010269165
2004	20.1970443725586
2005	17.0731716156006
2006	18.0487804412842
2007	14.0776700973511
2008	15.5339803695679
2009	12.9186601638794
2010	11.4285717010498
2011	12.7962083816528
2012	11.8483409881592
2013	11.3744077682495
2014	12.9807691574097
2015	11.9047622680664
2016	12.8571424484253
2017	14.7619047164917
2018	13.8095235824585
2019	13.3333330154419
2020	17.1428565979004
2021	20.9523811340332
2022	24.5283012390137