Year	Number
1996	16.0804023742676
1998	9.5
2000	7.96019887924194
2002	13.9303483963013
2003	14.4278602600098
2004	16.3461532592773
2005	14.8325357437134
2006	14.3540668487549
2007	16.7464122772217
2008	19.230770111084
2009	17.0616111755371
2010	14.2180099487305
2011	14.0845069885254
2012	15.4929580688477
2013	14.0845069885254
2014	12.0192308425903
2015	11.9047622680664
2016	12.8571424484253
2017	15.2380952835083
2018	16.6666660308838
2019	16.1904754638672
2020	18.5714282989502
2021	18.0952377319336
2022	12.2641506195068