Year	Number
1996	55.7788963317871
1998	56.5
2000	53.233829498291
2002	56.7164192199707
2003	54.7263679504395
2004	49.038459777832
2005	46.4114837646484
2006	47.3684196472168
2007	46.8899536132813
2008	48.0769233703613
2009	47.8672981262207
2010	45.971565246582
2011	47.417839050293
2012	47.417839050293
2013	49.2957763671875
2014	48.5576934814453
2015	49.0476188659668
2016	47.6190490722656
2017	43.3333320617676
2018	40
2019	38.0952377319336
2020	34.761905670166
2021	36.1904754638672
2022	33.9622650146484