Year	Number
1996	7.97872352600098
1998	15.957447052002
2000	24.8677253723145
2002	28.0423278808594
2003	28.1407032012939
2004	24.2718448638916
2005	20.8737869262695
2006	17.3913040161133
2007	14.0096616744995
2008	13.4615383148193
2009	14.6919431686401
2010	13.2701425552368
2011	15.6398105621338
2012	17.5355453491211
2013	15.6398105621338
2014	10
2015	10.9523811340332
2016	14.2857141494751
2017	11.4285717010498
2018	13.2075471878052
2019	11.7924528121948
2020	12.7358493804932
2021	13.6792449951172
2022	13.2075471878052