Year	Number
1996	51.2562828063965
1998	52
2000	43.7810935974121
2002	37.3134346008301
2003	32.8358192443848
2004	27.4038467407227
2005	23.9234447479248
2006	31.1004791259766
2007	34.9282302856445
2008	30.769229888916
2009	20.8530807495117
2010	17.5355453491211
2011	21.5962448120117
2012	27.6995296478271
2013	29.1079807281494
2014	30.769229888916
2015	29.0476188659668
2016	21.4285717010498
2017	27.1428565979004
2018	33.8095245361328
2019	31.4285717010498
2020	32.3809509277344
2021	33.8095245361328
2022	37.7358474731445