Year	annual %
1961	3.924708567838614
1962	4.6849613528450265
1963	4.863037269696312
1964	4.8565414202822845
1965	4.838005926972793
1966	4.8481476553449
1967	4.868940632642821
1968	4.885968718769907
1969	4.902886504107767
1970	4.655900255139713
1971	3.876813011865204
1972	2.9754763007136553
1973	2.63891788184161
1974	2.6625224228286895
1975	2.716252843948956
1976	2.6817587743420663
1977	2.57388285622908
1978	2.537674791687523
1979	2.527453113197187
1980	3.165920107499151
1981	7.468033215889541
1982	7.425811796868942
1983	7.263028292432827
1984	7.080695948985294
1985	6.87793958357071
1986	8.584000809883923
1987	8.319231657643256
1988	8.058379449477455
1989	7.8568823470460725
1990	7.886680073447624
1991	4.285592207533657
1992	4.486603166109963
1993	4.534770776130456
1994	4.465098673298255
1995	4.326570841629687
1996	4.213563663045929
1997	4.125295054695533
1998	4.0252840974900765
1999	3.908906985762749
2000	3.6553099146462897
2001	3.2571641521369465
2002	3.111503077704237
2003	2.9700014063901863
2004	2.8485456652866814
2005	2.7471375073312876
2006	2.6671764400557714
2007	2.5805288121852334
2008	2.4941266513211993
2009	2.389895898135378
2010	2.3856416855105165
2011	2.010574962271755
2012	1.9927150895172812
2013	1.9181012504154185
2014	1.9055369606348576
2015	1.874129116811309
2016	1.8714456610867847
2017	1.9016378475716886
2018	1.8187523693845082
2019	1.7171713691124062
2020	1.6554838253802138
2021	1.5758134087832356
2022	1.5426306758084851
2023	1.573509691247331