Year	Number
1996	24
1998	21.3930339813232
2000	22.3880596160889
2002	20.3980102539063
2003	11.9402980804443
2004	21.634614944458
2005	20.6730766296387
2006	12.0192308425903
2007	15.384614944458
2008	15.384614944458
2009	16.5876770019531
2010	14.2180099487305
2011	15.4929580688477
2012	14.5539903640747
2013	14.5539903640747
2014	12.8078813552856
2015	10.837438583374
2016	12.8078813552856
2017	12.3152713775635
2018	12.1359224319458
2019	12.0772943496704
2020	11.1111106872559
2021	11.5942029953003
2022	11.5942029953003