Year	Number
1996	26
1998	22.3880596160889
2000	26.8656711578369
2002	26.3681583404541
2003	25.3731346130371
2004	28.8461532592773
2005	22.115385055542
2006	16.8269233703613
2007	17.7884616851807
2008	17.7884616851807
2009	16.1137447357178
2010	18.0094795227051
2011	18.7793426513672
2012	16.9014091491699
2013	17.3708915710449
2014	19.2118225097656
2015	20.6896553039551
2016	19.7044334411621
2017	19.2118225097656
2018	19.4174766540527
2019	16.9082126617432
2020	16.9082126617432
2021	15.9420289993286
2022	17.8743953704834