Year	Number
1996	1.46238899230957
1998	1.42910289764404
2000	1.49271559715271
2002	1.47299218177795
2003	1.55566942691803
2004	1.62832796573639
2005	1.568608045578
2006	1.44533681869507
2007	1.43100023269653
2008	1.4256500005722
2009	1.41521406173706
2010	1.44575238227844
2011	1.41072964668274
2012	1.44295036792755
2013	1.43956887722015
2014	1.35735297203064
2015	1.37652158737183
2016	1.35611021518707
2017	1.37918603420258
2018	1.38901424407959
2019	1.30208480358124
2020	1.3812929391861
2021	1.36291229724884
2022	1.42238974571228