Year	Number
1996	1.31814324855804
1998	1.33475875854492
2000	1.31340384483337
2002	1.31074380874634
2003	1.33278954029083
2004	1.30641043186188
2005	1.26966309547424
2006	1.25131320953369
2007	1.26187098026276
2008	1.27677536010742
2009	1.3177649974823
2010	1.30177271366119
2011	1.27229809761047
2012	1.26053082942963
2013	1.25354850292206
2014	1.22070860862732
2015	1.15181076526642
2016	1.15955591201782
2017	1.17175841331482
2018	1.17916560173035
2019	1.17659223079681
2020	1.26600527763367
2021	1.2798718214035
2022	1.27020359039307