Year	Number
1975	48.91964573901112
1976	13.454159567503527
1977	7.49767519089425
1978	10.377645248114508
1979	2.922277451400237
1980	5.796294945612459
1981	9.848344800277587
1982	8.232086577723894
1983	26.475485324494045
1984	8.648579985623147
1985	14.51584858194071
1986	5.685730454622919
1987	3.8358048961782196
1988	5.53019864883866
1989	7.260209837279839
1990	6.968978054062136
1991	6.486866532942888
1992	6.439490315712914
1993	6.5261263488050805
1994	8.857967029090041
1995	7.44860634644404
1996	7.6547276259773485
1997	7.691000321741111
1998	6.852045420546661
1999	6.52415446936611
2000	6.788446618878395
2001	6.721393813062371
2002	5.048640862745533
2003	5.2165785205563155
2004	6.269327112078979
2005	5.690851276697653
2006	4.935105192455794
2007	5.663677282896405
2008	6.563436162355533
2009	5.280559574467322
2010	5.374557241247907
2011	5.175286351428836
2012	4.941418055708271
2013	5.531131952645405
2014	4.982052783969251
2015	4.14505171253287
2016	2.502007167383321
2017	3.0653363611673194
2018	3.4545627224377093
2019	3.7574545236661625
2020	3.102598874036532
2021	2.745212635741561
2022	2.5316364464673757
2023	2.806061909907122