Year	Number
1996	15.2173910140991
1998	20.1086959838867
2000	25.543478012085
2002	21.0810813903809
2003	18.9189186096191
2004	20.8955230712891
2005	18.1372547149658
2006	20.0980396270752
2007	18.9320392608643
2008	22.3300971984863
2009	25.8373203277588
2010	26.3157901763916
2011	26.0663509368896
2012	24.6445503234863
2013	25.5924167633057
2014	26.4423084259033
2015	22.380952835083
2016	12.380952835083
2017	11.9047622680664
2018	11.4285717010498
2019	11.4285717010498
2020	11.4285717010498
2021	12.8571424484253
2022	15.5660381317139