Year	Number
1996	1.16952216625214
1998	1.18287515640259
2000	1.16698145866394
2002	1.28276693820953
2003	1.46513116359711
2004	1.51525795459747
2005	1.38492727279663
2006	1.34965407848358
2007	1.34201574325562
2008	1.33847212791443
2009	1.55316376686096
2010	1.54408740997314
2011	1.49057960510254
2012	1.38919961452484
2013	1.39717161655426
2014	1.45886182785034
2015	1.43777513504028
2016	1.45326995849609
2017	1.45908296108246
2018	1.45358550548553
2019	1.59749317169189
2020	1.66911089420319
2021	1.59549152851105
2022	1.64433610439301