Year	annual %
1961	6.378174909459755
1962	7.897790628934752
1963	7.854817141887866
1964	7.804297649397368
1965	7.741191710170512
1966	7.6946246241732394
1967	7.631513182637422
1968	7.569122667859185
1969	7.703209483306628
1970	7.793000352910699
1971	8.375474510679352
1972	8.159480112846206
1973	7.959429691358354
1974	7.815772032402177
1975	7.673990674950362
1976	7.550302369149203
1977	7.402013456861331
1978	7.265446171175004
1979	7.10129613687905
1980	6.937379317552428
1981	6.763863840649142
1982	5.032802346121868
1983	4.9878855094501535
1984	4.94299335873525
1985	4.87772540739337
1986	4.823386497592548
1987	4.767452860512154
1988	4.922233832777393
1989	4.817348640871779
1990	4.707931636449951
1991	4.596031661753535
1992	4.4916273700471026
1993	4.385094699662127
1994	3.8695176117933467
1995	3.7376217437503474
1996	3.6597089457265946
1997	3.6055368872673847
1998	3.574290794186661
1999	3.5489096124938104
2000	3.5497425071257487
2001	3.5609554354997797
2002	3.5700900726300446
2003	3.5844525165144048
2004	3.6232785326017045
2005	3.689618427764365
2006	3.775816191667468
2007	3.856795031750676
2008	3.9221098417020275
2009	3.9970584738200317
2010	4.099968791778441
2011	4.176634128065068
2012	4.185787962249702
2013	4.105879239577575
2014	3.9074456633190757
2015	3.6183231136620817
2016	3.3033981297542607
2017	3.025711109586608
2018	2.83317153124508
2019	2.7041461137457152
2020	2.585990581055065
2021	2.4646970437302125
2022	2.366156727595874
2023	2.2953219387883705