Year	Number
1996	27.5
1998	26.3681583404541
2000	24.3781089782715
2002	14.9253730773926
2003	23.8805961608887
2004	20.1923084259033
2005	17.3076915740967
2006	16.3461532592773
2007	16.3461532592773
2008	12.9807691574097
2009	12.7962083816528
2010	11.3744077682495
2011	9.38967132568359
2012	9.38967132568359
2013	11.7370891571045
2014	11.822660446167
2015	7.38916254043579
2016	5.41871929168701
2017	5.41871929168701
2018	3.88349509239197
2019	4.34782600402832
2020	4.34782600402832
2021	3.86473441123962
2022	5.79710149765015