Year	Number
1996	12.3655910491943
1998	13.9037437438965
2000	9.57446765899658
2002	8.99470901489258
2003	11.640212059021
2004	12.3152713775635
2005	16.5853652954102
2006	18.0487804412842
2007	17.9611644744873
2008	16.019416809082
2009	19.1387557983398
2010	16.6666660308838
2011	17.5355453491211
2012	18.9573459625244
2013	18.9573459625244
2014	23.5576915740967
2015	20.9523811340332
2016	21.9047622680664
2017	20
2018	37.6190490722656
2019	45.238094329834
2020	40.9523811340332
2021	47.1428565979004
2022	48.5849075317383