Year	Number
1960	10.632213972528968
1961	31.10045479927965
1962	14.438325022266026
1963	10.764470517937246
1964	9.852674823060305
1965	6.66562671397911
1966	7.70605256151224
1967	10.045245121725939
1968	11.560933070659411
1969	18.388086761068077
1970	6.507592860517061
1971	4.488777724215526
1972	3.2232357251029176
1973	2.124395819399362
1974	1.650699130531427
1975	1.9917178649763931
1976	2.089505457740134
1977	2.839175573887669
1978	2.784982958969976
1979	2.1085780173913733
1980	1.9598777915319259
1981	3.0452964544072825
1982	5.482031965385343
1983	13.08579479167138
1984	10.42677013618906
1985	8.090843696022583
1986	3.158376050181531
1987	3.948046254140845
1988	5.0581353690451785
1989	5.781934528219178
1990	7.452588888569577
1991	3.562562745143732
1992	3.608452211296662
1993	3.911435386722489
1994	4.225645998067978
1995	4.939003555542486
1996	3.9607193163137886
1997	5.840650089553707
1998	3.687466521043038
1999	3.2427673867586115
2000	3.100177223006659
2001	2.840313303759215
2002	2.9657857912949046
2003	2.8131517526451915
2004	3.1703266119315936
2005	3.0281047666027363
2006	3.2286230137555068
2007	2.678017676422905
2008	2.760807963773682
2009	2.36505203918615
2010	1.9662305438230456
2011	1.7891156540037854
2012	1.7600763806476956
2013	2.2811444666907903
2014	2.5616793395072905
2015	2.6949376625503354
2016	2.925190424761599
2017	3.0428942822548564
2018	3.2634375200582206
2019	3.2244330275820525
2020	2.976177095818716
2021	3.2745726070880434
2022	3.6147503459228867