Year	Number
1996	41.5
1998	41.7910461425781
2000	30.8457717895508
2002	23.8805961608887
2003	23.3830852508545
2004	20.6730766296387
2005	17.3076915740967
2006	18.269229888916
2007	19.7115383148193
2008	21.1538467407227
2009	23.6966819763184
2010	24.6445503234863
2011	23.474178314209
2012	29.1079807281494
2013	29.1079807281494
2014	37.4384231567383
2015	39.4088668823242
2016	42.3645324707031
2017	42.8571434020996
2018	43.2038841247559
2019	42.9951705932617
2020	35.7487907409668
2021	36.2318840026855
2022	38.6473426818848