Year	Number
1996	47.3118286132813
1998	34.2245979309082
2000	34.5744667053223
2002	31.7460308074951
2003	32.2751312255859
2004	34.4827575683594
2005	34.634147644043
2006	36.0975608825684
2007	34.4660186767578
2008	33.980583190918
2009	28.7081336975098
2010	28.0952377319336
2011	24.6445503234863
2012	24.6445503234863
2013	21.8009471893311
2014	20.1923084259033
2015	20.9523811340332
2016	19.0476188659668
2017	18.0952377319336
2018	21.9047622680664
2019	17.1428565979004
2020	22.380952835083
2021	24.2857151031494
2022	23.1132068634033