Year	Number
1996	1.43508553504944
1998	1.30619204044342
2000	1.4075014591217
2002	1.22893154621124
2003	1.24776077270508
2004	1.12897205352783
2005	1.11754953861237
2006	1.11987686157227
2007	1.1538097858429
2008	1.18374812602997
2009	1.15600228309631
2010	1.15678811073303
2011	1.16937839984894
2012	1.03779828548431
2013	1.02529191970825
2014	0.966522395610809
2015	0.885937511920929
2016	0.965485215187073
2017	1.02350747585297
2018	0.978212118148804
2019	0.990445971488953
2020	0.862033605575562
2021	0.843659341335297
2022	0.79993212223053