Year	Number
1965	0.7534848657523028
1966	0.9539172245500337
1967	1.291930744397973
1968	1.5529084764506669
1969	1.088846872719161
1970	0.9866335475379131
1971	1.5920214401806685
1972	2.7874654123847273
1973	3.0295916924157145
1974	3.50188251436681
1975	4.637879419054887
1976	7.714008784677021
1977	9.406409378131476
1978	8.270811257865233
1979	5.492331405961855
1980	5.577696374319346
1981	7.898658896270491
1982	8.956971944760108
1983	8.411870403254651
1984	17.14029601156475
1985	3.328657006187848
1986	7.294602630446101
1987	5.942497164299199
1988	8.790103910468419
1989	9.841327297487988
1990	3.5633656211513696
1991	3.9242305415056395
1993	2.395083286876805
1994	1.849818546693629
1995	2.6822184578743067
1996	2.5905133976825967
1997	2.7730583674106053
1998	8.473562762721984
1999	12.885581995680738
2000	3.1893669278247554
2001	3.986479855381937
2002	1.43786640069591
2003	3.607342455883859
2004	3.4646958727827797
2005	2.3065825197033547
2006	3.20138561536473
2007	2.3838124556535476
2008	3.122726730435166
2009	1.4450634849993746
2010	1.7838148777859055
2011	1.9302491601821703
2012	1.6411390490304876
2013	2.142928686155868
2014	1.8450708087999
2015	1.8455827694400107
2016	1.8371818120564216
2017	2.729324789470674
2018	3.838585576430787
2019	3.7969830759657985
2020	4.703204688000179
2021	1.9522740574016852
2022	2.665920888035398