Year	Number
1996	1.34345364570618
1998	1.51291000843048
2000	1.58410012722015
2002	1.50421679019928
2003	1.34845769405365
2004	1.17082571983337
2005	1.29866683483124
2006	1.19241058826447
2007	1.21519267559052
2008	1.18687438964844
2009	1.05736601352692
2010	1.02016532421112
2011	0.948998928070068
2012	0.941072702407837
2013	0.901075720787048
2014	1.05299115180969
2015	0.89533257484436
2016	0.833849668502808
2017	0.993408679962158
2018	1.01116824150085
2019	0.959303259849548
2020	0.965446054935455
2021	0.843531429767609
2022	0.881889522075653