Year	Number
1977	1.724293005436955
1978	1.2168071283712079
1979	1.242036934197755
1980	0.7437743341107054
1981	0.5049015193449328
1982	0.2747594759018773
1983	0.9905820502787871
1984	0.4044325129846397
1985	0.7360223250825774
1986	9.075431966746855
1987	0.34509682062558006
1988	0.5300391923539876
1989	0.18252041136763902
1990	0.2272631822674516
1991	0.5263147932084391
1992	1.0463691676874693
1993	1.3671413221204183
1994	1.3802672677535694
1995	1.4309750180195318
1996	0.9207888210022279
1997	3.5756593742263845
1998	3.387533794559407
1999	2.3474811422606865
2000	2.250434335547764
2001	2.1175062681605445
2002	2.8480972370477327
2003	1.8980113508837835
2004	3.492469957587682
2005	4.0171735715707735
2006	4.530431131852024
2007	4.077268945186236
2008	3.8592064301189213
2009	6.100855057824849
2010	4.120102118650574
2011	1.9436310979612887
2012	2.132933950116975
2013	2.3602853088336806
2014	2.2109761647644484
2015	2.958707893271021
2016	3.908310127288467
2017	3.8590651460509457
2018	3.577779151346138
2019	3.3350159680747997
2020	5.947780163498991
2021	5.714570014247921
2022	3.596621207667966