Year	Number
1983	1.484861292898289
1984	1.5916307004017203
1985	1.7324854097887972
1986	1.9780619820917946
1987	1.834731724579725
1988	1.694946348423165
1989	1.3998590058522038
1990	1.5176888926750558
1991	1.3118266238196163
1992	2.143822780502799
1993	2.3921049256869087
1994	2.397315275989721
1995	2.370285748189357
1996	2.902412450575568
1997	2.4989910530212334
1998	2.5247485095160793
1999	2.342261277623632
2000	2.7185025838628483
2001	3.519884260655544
2002	3.4193849113367905
2003	3.352607071499747
2004	2.7991767355882744
2005	2.297895364929307
2006	2.2601848060981222
2007	2.6760933868603742
2008	2.5519619640593363
2009	3.750837155743819
2010	3.7840351034681965
2011	3.4719464541242244
2012	3.517531166660558
2013	3.2462390074258236
2014	3.265677387265823
2015	3.32310348475337
2016	3.478667872662173
2017	3.5748897312573273
2018	3.245919601922921
2019	3.4307682999790723
2020	5.695007795311399
2021	4.975504897287308
2022	4.304012949823226