Year	Number
1986	4.925194467046375
1987	4.570656401673644
1988	3.3844979699068523
1989	2.92182222697615
1990	2.2174004237288143
1991	1.1795463727540154
1992	1.2928753559543023
1993	1.5191984906481757
1994	1.3942982292637502
1995	1.500180684335771
1996	1.0402731802005831
1997	0.8786538856794588
1998	1.426411128653454
1999	1.7874987631209425
2000	1.7850343060437983
2001	2.275344375772554
2002	2.558115608372096
2003	2.154840963927159
2004	0.9370178002391877
2005	0.7049904744103401
2006	0.8528703093605994
2007	0.8557449448934608
2008	1.1859938209850929
2009	2.50264881835759
2010	3.7635467035526275
2011	1.1747197705804477
2012	3.0534505278342845
2013	3.1814607320358745
2014	3.3921396339128105
2015	4.242411355765582
2016	5.035573273143662
2017	4.801693222647853
2018	4.617169363323658
2019	4.737651224468425
2020	8.128755408054882
2021	8.608908926315628
2022	6.9782844180382195