Year	Number
1996	23.3695659637451
1998	24.456521987915
2000	22.2826080322266
2002	21.0810813903809
2003	22.7027034759521
2004	20.8955230712891
2005	23.0392150878906
2006	17.6470584869385
2007	17.4757289886475
2008	18.4466018676758
2009	18.1818180084229
2010	18.6602878570557
2011	16.1137447357178
2012	18.0094795227051
2013	17.5355453491211
2014	19.230770111084
2015	20.4761905670166
2016	23.3333339691162
2017	24.761905670166
2018	16.1904754638672
2019	14.2857141494751
2020	14.7619047164917
2021	17.619047164917
2022	17.9245281219482