Year	Number
1996	13.0653266906738
1998	14.5
2000	18.9054718017578
2002	29.8507461547852
2003	28.3582096099854
2004	21.634614944458
2005	25.3588523864746
2006	19.6172256469727
2007	13.3971290588379
2008	13.942307472229
2009	15.1658763885498
2010	16.1137447357178
2011	15.4929580688477
2012	15.962441444397
2013	15.023473739624
2014	24.519229888916
2015	21.4285717010498
2016	18.5714282989502
2017	11.4285717010498
2018	15.2380952835083
2019	15.7142858505249
2020	16.6666660308838
2021	17.619047164917
2022	17.9245281219482