Year	Number
1996	16.582914352417
1998	17
2000	24.3781089782715
2002	17.9104480743408
2003	14.9253730773926
2004	16.3461532592773
2005	15.7894735336304
2006	12.9186601638794
2007	12.4401912689209
2008	11.5384616851807
2009	17.0616111755371
2010	18.9573459625244
2011	15.4929580688477
2012	13.6150236129761
2013	13.6150236129761
2014	15.384614944458
2015	15.7142858505249
2016	15.2380952835083
2017	12.8571424484253
2018	13.8095235824585
2019	12.8571424484253
2020	13.3333330154419
2021	13.3333330154419
2022	13.2075471878052