Year	Number
1996	1.17166376113892
1998	1.19583570957184
2000	1.07490420341492
2002	1.29533743858337
2003	1.1232738494873
2004	1.10752463340759
2005	1.15242898464203
2006	1.26175379753113
2007	1.42116558551788
2008	1.5237752199173
2009	1.41438210010529
2010	1.52651119232178
2011	1.55788862705231
2012	1.38360106945038
2013	1.36044573783875
2014	1.13593256473541
2015	1.01833045482635
2016	0.926982343196869
2017	0.885234951972961
2018	0.883697271347046
2019	0.955951392650604
2020	0.839920282363892
2021	0.699314296245575
2022	0.730678856372833