Year	Number
1996	80.6451644897461
1998	73.7967910766602
2000	64.361701965332
2002	58.201057434082
2003	59.2592582702637
2004	55.6650238037109
2005	57.073169708252
2006	52.6829261779785
2007	55.8252410888672
2008	55.3398056030273
2009	57.4162673950195
2010	52.8571434020996
2011	54.502368927002
2012	53.554500579834
2013	50.2369651794434
2014	39.4230766296387
2015	44.2857131958008
2016	45.238094329834
2017	42.8571434020996
2018	41.9047622680664
2019	47.1428565979004
2020	48.0952377319336
2021	46.1904754638672
2022	40.5660362243652