Year	Number
1979	0.7619666683972796
1980	0.33893657193431015
1984	0.957733001721829
1985	0.8103946223803875
1986	0.6482752797473776
1987	1.2611920172374311
1988	1.4677494616552653
1989	1.5408370600508896
1990	2.9389180681855716
1991	2.114280946807467
1992	2.2209079052208938
1993	2.0602453724889105
1994	2.904196583504001
1995	4.862886771315711
1996	4.93786631096595
1997	5.073099481582909
1998	6.1324791189995835
1999	5.963702612970842
2000	5.411441589882497
2001	5.115910605135654
2002	5.327267126318349
2003	4.885713211668861
2004	4.049417840920395
2005	4.120634121969699
2006	3.682381401868442
2007	3.7597331154542664
2008	2.898968855073507
2009	4.960076488689679
2010	4.879265933891059
2011	4.389416519200195
2012	5.142131503880475
2013	4.841398390424403
2014	4.25394998009421
2015	4.627797564218149
2016	5.398224141116849
2017	4.606830271289511
2018	4.153560056381121
2019	4.610434842052857
2020	5.780112907740902
2021	4.791198105305181
2022	4.2786177365241995
2023	4.9096967968527085