Year	annual %
1961	2.3362071788650667
1962	2.3742119375889956
1963	2.4095155843133114
1964	2.4721470177815377
1965	2.5225143501230747
1966	2.5340399084879976
1967	2.597076307605178
1968	2.657150997527964
1969	2.6483209319990095
1970	2.652148550053653
1971	2.6403897535751213
1972	2.576831309661415
1973	2.586446320877215
1974	2.6505751418644365
1975	2.6502559596926574
1976	2.634625669439501
1977	2.552856299907603
1978	2.7233093618439455
1979	2.780583235061428
1980	2.2098580568310524
1981	1.9174147230315555
1982	2.3514651583652153
1983	2.6356217186293236
1984	2.676934004350315
1985	2.6755927761332003
1986	2.5935700974792297
1987	2.613043006662579
1988	2.5718912472558486
1989	2.632657693941809
1990	2.55294504860683
1991	2.543251214354285
1992	3.0036964673581252
1993	3.1724564023742516
1994	2.915554178862223
1995	2.881920551095149
1996	2.956383131614544
1997	2.8348594888817615
1998	2.7505491259994557
1999	2.7925192139908575
2000	2.687607275788423
2001	2.7002064959392555
2002	3.015238350215114
2003	3.0735663867653216
2004	2.910155943885613
2005	2.9188562478256017
2006	3.038429912875486
2007	3.0084236970447904
2008	2.9061187532809925
2009	2.894152653681047
2010	2.8771475921054446
2011	2.859480251610094
2012	2.7585389937330405
2013	2.5616786537626837
2014	2.503727467882271
2015	2.5490000836635716
2016	2.6642373064387215
2017	2.7210654179362024
2018	2.7557707608628164
2019	2.835725959896891
2020	2.8205108633137144
2021	2.727872106602746
2022	2.6965205245423647
2023	2.73630087129024