Year	Number
1996	1.50104010105133
1998	1.59148979187012
2000	1.53968262672424
2002	1.5953254699707
2003	1.48246681690216
2004	1.51067984104156
2005	1.58428418636322
2006	1.70889830589294
2007	1.72822141647339
2008	1.70412838459015
2009	1.74309933185577
2010	1.76081323623657
2011	1.74646854400635
2012	1.7272036075592
2013	1.70915544033051
2014	1.76069474220276
2015	1.72868657112122
2016	1.46629631519318
2017	1.37986326217651
2018	1.41238701343536
2019	1.34780561923981
2020	1.45693945884705
2021	1.493408203125
2022	1.5274144411087