Year	Number
1974	1.59866353125447
1975	0.8501671352438425
1976	1.222245066723314
1977	1.814020683811624
1978	1.2150551390306759
1979	0.0630872965274089
1980	0.09737745112478328
1981	0.3847505401928877
1982	0.3183320099884814
1983	0.5222688161627219
1984	1.0605082367809988
1985	0.9137928285453627
1986	1.9726703086862993
1987	3.0625219888083617
1988	3.5262430256532924
1989	3.8879066154464432
1990	1.1223156312006664
1991	1.2625934108344894
1992	1.146489725469244
1993	0.9973313782370035
1994	0.8330447990731713
1995	1.126395784850237
1996	2.514390328424802
1997	3.22767517159085
1998	1.9148354505406724
1999	2.5207671960687525
2000	2.80775035903233
2001	3.65342235390106
2002	2.4507690661292534
2003	3.4049714220306924
2004	3.650850133189528
2005	2.5167291003804064
2006	2.787174274113617
2007	2.870868143245888
2008	2.397488856602641
2009	2.8811748354594937
2010	3.3594889714867646
2011	3.301208336320823
2012	2.90517288851124
2013	2.018281462190027
2014	2.1118867273542485
2015	2.5168824418616738
2016	3.492503511364189
2017	3.884141825379888
2018	3.9134178831186173
2019	3.8800063040462547
2020	5.730640332604338
2021	5.469465054697224
2022	3.981706000906688