Year	Number
1996	17.9347820281982
1998	22.2826080322266
2000	21.1956520080566
2002	21.0810813903809
2003	21.0810813903809
2004	25.3731346130371
2005	24.5098037719727
2006	22.5490188598633
2007	22.3300971984863
2008	24.2718448638916
2009	25.3588523864746
2010	31.1004791259766
2011	28.9099521636963
2012	29.8578205108643
2013	29.8578205108643
2014	26.4423084259033
2015	27.1428565979004
2016	20.4761905670166
2017	13.8095235824585
2018	11.9047622680664
2019	11.9047622680664
2020	13.3333330154419
2021	9.5238094329834
2022	8.96226406097412