Year	Number
1976	5.864907513891424
1977	8.17425274944621
1978	11.772465360677202
1979	13.3051753882819
1980	6.973002855668615
1981	3.6419958359558193
1982	4.4512870460929435
1983	2.7900530108369748
1984	2.505728001317701
1985	5.0023692935023485
1986	4.5401528285763115
1987	3.546871811921159
1988	4.785784831335551
1989	2.890490684598002
1990	5.699578958465028
1991	5.09620553340786
1992	5.70506107278321
1993	6.743860565121778
1994	5.596781886547523
1995	5.472482854504448
1996	5.897895111521169
1997	5.475660581569479
1998	5.699148357739966
1999	6.804642133034228
2000	6.283222046263753
2001	4.293714060253424
2002	5.275431706734425
2003	5.700137452154185
2004	5.77837779911896
2005	7.260297762982133
2006	7.028972393704948
2007	8.171534286186459
2008	6.714258311383269
2009	9.067499928752433
2010	7.276971039673735
2011	5.201951577988217
2012	5.218290412198939
2013	3.4601520546215863
2014	3.9629991933667768
2015	3.362144257077014
2016	5.097196244875399
2017	6.050387665825614
2018	7.111112111500855
2019	5.942201218463155
2020	7.094054010095153
2021	5.61648258498164
2022	4.758889184295386
2023	2.4614211222905134