Year	Number
1996	1.38130235671997
1998	1.38531887531281
2000	1.60547471046448
2002	1.63791656494141
2003	1.44070816040039
2004	1.31543505191803
2005	1.33164858818054
2006	1.3998988866806
2007	1.48371803760529
2008	1.51193952560425
2009	1.45038175582886
2010	1.46121859550476
2011	1.31742680072784
2012	1.33191883563995
2013	1.33524811267853
2014	1.37832379341125
2015	1.42636823654175
2016	1.40361714363098
2017	1.31289196014404
2018	1.34725511074066
2019	1.33317494392395
2020	1.21239566802979
2021	1.1939195394516
2022	1.06388890743256