Year	Number
1996	1.41403770446777
1998	1.40335631370544
2000	1.38048672676086
2002	1.36772322654724
2003	1.34903717041016
2004	1.50376403331757
2005	1.28759801387787
2006	1.53840279579163
2007	1.50177264213562
2008	1.52840650081635
2009	1.53620111942291
2010	1.51271617412567
2011	1.49892425537109
2012	1.52334606647491
2013	1.53268504142761
2014	1.71228265762329
2015	1.74090492725372
2016	1.80549323558807
2017	1.87640738487244
2018	1.87926542758942
2019	1.85206508636475
2020	1.74941408634186
2021	1.74925327301025
2022	1.49530494213104