Year	Number
1996	32.5
1998	36.3184089660645
2000	28.8557205200195
2002	23.8805961608887
2003	24.3781089782715
2004	21.634614944458
2005	24.0384616851807
2006	20.6730766296387
2007	20.6730766296387
2008	22.115385055542
2009	23.6966819763184
2010	21.8009471893311
2011	21.5962448120117
2012	18.7793426513672
2013	16.9014091491699
2014	21.1822662353516
2015	22.1674880981445
2016	22.1674880981445
2017	21.1822662353516
2018	20.8737869262695
2019	20.2898559570313
2020	21.7391300201416
2021	22.7053146362305
2022	24.6376819610596