Year	Number
1976	0.7291185851777157
1977	1.1895308642089866
1978	0.7778526000791596
1979	2.8999180999410927
1980	1.1079595959694606
1981	0.6974122767618434
1982	1.0206838186794036
1983	0.3452161499870427
1984	1.0144545112459267
1985	0.5974400333838904
1986	1.6269571293220717
1987	2.6792446562601473
1988	1.610619293945836
1989	1.0966454478174332
1990	1.214778226314858
1991	1.553854033146494
1992	1.8170637577694901
1993	1.8828407827208968
1994	1.356401397244247
1995	1.6712119791135382
1996	1.4768508918640277
1997	1.4827233983060963
1998	1.7285806263750123
1999	1.7976685782243043
2000	1.389230357734287
2001	1.6847530669898236
2002	2.5599117752141662
2003	2.5214494689851175
2004	2.009910284943091
2005	2.198636467033264
2006	2.8582256497802554
2007	2.3787487557197684
2008	1.8364177021655446
2009	2.659799690449854
2010	2.54990654602849
2011	2.812957457626532
2012	3.4243079682239603
2013	2.93403628256714
2014	3.325098973786029
2015	4.224318797308214
2016	7.344095447144452
2017	7.58518468587758
2018	5.229634695212411
2019	4.047170085591678
2020	6.503182346350845
2021	7.113776849734786
2022	6.874592463614068
2023	5.236549816140409