Year	Number
1996	12.9032258987427
1998	11.2299461364746
2000	12.2340421676636
2002	19.5767192840576
2003	18.518518447876
2004	13.7931032180786
2005	9.7560977935791
2006	17.0731716156006
2007	15.5339803695679
2008	14.5631065368652
2009	5.26315784454346
2010	4.2857141494751
2011	2.84360194206238
2012	4.26540279388428
2013	8.05687236785889
2014	9.61538505554199
2015	8.5714282989502
2016	10.9523811340332
2017	11.9047622680664
2018	12.8571424484253
2019	15.2380952835083
2020	15.7142858505249
2021	22.380952835083
2022	24.5283012390137