Year	annual %
1961	2.4581643273590146
1962	2.484058235657713
1963	2.54351541419895
1964	2.582339631445933
1965	2.6210112513437736
1966	2.647307870030957
1967	2.645332417906502
1968	2.656379147647826
1969	2.6788781121011027
1970	2.6941541410709675
1971	2.6396759572111677
1972	2.653223831763256
1973	2.756819924613268
1974	2.8272008361473837
1975	2.9104918895628913
1976	2.9688161218090983
1977	3.019643404597147
1978	3.0442749156014486
1979	3.149962082928198
1980	3.568167930111926
1981	3.723636196156207
1982	3.447273353815646
1983	3.101200624170005
1984	2.9309519976334
1985	3.0759688902091114
1986	3.150059702188841
1987	3.1353142410343224
1988	3.112693850757168
1989	3.0419260662539784
1990	2.971347532900296
1991	2.918907316907763
1992	2.6538369252720173
1993	2.5840752649688596
1994	2.6660709043847817
1995	2.6835265725771507
1996	2.7317243658019095
1997	2.674226249544475
1998	2.632737026295146
1999	2.599723098823816
2000	2.739138303405369
2001	2.7541644560076435
2002	2.504789098283851
2003	2.374179907435092
2004	2.4025635731806005
2005	2.367595851097164
2006	2.3597285005704407
2007	2.4013671854045384
2008	2.4281393079902784
2009	2.4695736337866805
2010	2.5511745720321386
2011	2.4710525245474173
2012	2.2539548992264855
2013	2.1292936834406646
2014	2.0617814072875404
2015	1.9853084740718145
2016	1.929098103093068
2017	1.9750272946588154
2018	2.035818774190105
2019	2.0499350976034094
2020	2.1008091968563605
2021	2.1217665991079855
2022	2.134495328948077
2023	2.1679566272462267