Year	Number
1976	1.2362434792942172
1978	0.9151743165343829
1979	0.9197064989577962
1980	0.7344839317600111
1981	0.6446111766642283
1982	0.7229080916697702
1983	0.8277265530108215
1984	0.995710455764075
1985	0.9799870884441575
1986	1.6055811016163115
1987	1.7403254216005992
1988	1.4439015068792311
1989	1.3951541651640842
1990	1.5195815176719503
1991	1.5548098309029117
1992	1.6876048036257805
1993	1.8377535786345933
1994	1.6992644176006757
1995	1.7184040777314398
1996	1.5758822011026123
1997	1.6131421865755307
1998	1.7918034320133078
1999	1.7829075274027786
2000	1.686145442009868
2001	2.0893526218824965
2002	2.2669499847919354
2003	2.0701420044721774
2004	2.4563968535111926
2005	1.8640994999593121
2006	1.9170274842225459
2007	1.8924737623946952
2008	1.6876139706247102
2009	2.5773211904376323
2010	2.530861989216289
2011	2.532310538789977
2012	2.8820653808805066
2013	2.3869077740879896
2014	3.1296032780902974
2015	3.7480707190008165
2016	3.4499982517246433
2017	3.47441325755226
2018	3.000203244669303
2019	2.6203955574030964
2020	3.434798672763957
2021	5.15714109905365
2022	3.2635565014745347
2023	3.330928353088039