Year	Number
1996	1.19231188297272
1998	1.06593120098114
2000	1.22991895675659
2002	0.936939835548401
2003	1.16987371444702
2004	1.20001101493835
2005	1.2101241350174
2006	1.3208487033844
2007	1.23022782802582
2008	1.32388854026794
2009	1.36922454833984
2010	1.55362319946289
2011	1.55437541007996
2012	1.61894869804382
2013	1.64827847480774
2014	1.69047617912292
2015	1.53004574775696
2016	1.48238265514374
2017	1.4809068441391
2018	1.38864803314209
2019	1.43116724491119
2020	1.46393418312073
2021	1.53605020046234
2022	1.53997182846069