Year	Number
1989	1.3044196399814099
1990	1.2125023431483641
1991	1.3186120519837714
1992	1.2287354480293047
1993	1.2788082787314916
1994	1.4607585939326528
1995	1.9614922383745983
1996	1.9913152178261653
1997	2.3136067749155433
1998	2.1584536756950143
1999	2.667524122141303
2000	3.035894485210446
2001	3.016975424529538
2002	2.775665791329428
2003	1.992613553144972
2004	1.7527014341170366
2005	2.6643824824103164
2006	2.6808676491321184
2007	2.2154675706168647
2008	2.2588465333503978
2009	1.4643535837220625
2010	1.5416449270189037
2011	1.165778321883545
2012	1.335705960075022
2013	1.3196603151305792
2014	1.3464912974362846
2015	1.484153856925433
2016	1.3085365731026968
2017	1.2773949407469922
2018	1.2823336650793795
2019	1.2134358598665076
2020	1.0244470398444097
2021	0.9967979354417977
2022	0.9976558686331998
2023	0.9270448589805789