Year	Number
1996	30.6010932922363
1998	22.4043712615967
2000	25.1366119384766
2002	23.2432441711426
2003	21.0810813903809
2004	12.93532371521
2005	10.2941179275513
2006	11.7073173522949
2007	16.019416809082
2008	14.0776700973511
2009	12.4401912689209
2010	13.3971290588379
2011	14.2180099487305
2012	13.2701425552368
2013	15.1658763885498
2014	15.865385055542
2015	15.7142858505249
2016	11.9047622680664
2017	13.3333330154419
2018	13.3333330154419
2019	9.5238094329834
2020	9.0476188659668
2021	8.5714282989502
2022	10.8490562438965