Year	Number
1996	1.60952925682068
1998	1.62198948860168
2000	1.60941886901855
2002	1.63438987731934
2003	1.6375846862793
2004	1.62020444869995
2005	1.65219819545746
2006	1.77008616924286
2007	1.75559067726135
2008	1.73402619361877
2009	1.64867222309113
2010	1.63750469684601
2011	1.61821925640106
2012	1.66923201084137
2013	1.64211285114288
2014	1.85037338733673
2015	1.75965988636017
2016	1.58385276794434
2017	1.57362115383148
2018	1.59134912490845
2019	1.58125305175781
2020	1.51979923248291
2021	1.57233679294586
2022	1.53315436840057