Year	annual %
1961	5.59430751417022
1962	5.568733579754582
1963	5.536256916603045
1964	5.528652477361164
1965	5.52778430678751
1966	5.548155803858096
1967	5.56391434791234
1968	5.550070209193018
1969	5.510839621540444
1970	5.490103589727566
1971	5.323996375039026
1972	5.304912822754287
1973	5.266574494251819
1974	5.176142456752841
1975	5.010644357393968
1976	4.601124739158651
1977	3.4251785321967745
1978	3.326379647702192
1979	3.380112336811134
1980	3.463184542094846
1981	3.546421601258303
1982	3.612106191616525
1983	3.6558075416096356
1984	3.6859790954391056
1985	3.73999364469995
1986	3.8289789289751104
1987	3.871935348787767
1988	3.796383076302598
1989	3.2517937554925282
1990	3.24627523789646
1991	3.21984231490932
1992	3.1635723546398395
1993	3.1054987935615475
1994	3.0169829647083932
1995	2.8893776247158547
1996	2.7722797714995537
1997	2.68267728392177
1998	2.6512420936782393
1999	2.6729773346672316
2000	2.708788316465087
2001	2.736564546910759
2002	2.7677564938443613
2003	3.174036076992385
2004	3.4930031844201506
2005	3.5241710163463535
2006	3.58041901367083
2007	3.6037830682049083
2008	3.6014940317699704
2009	3.631500710591544
2010	3.6609864276196795
2011	3.665643914101355
2012	3.6617480147883277
2013	3.6401797851329873
2014	3.641058380116588
2015	3.657856948873587
2016	3.657309854479153
2017	3.672444682636066
2018	3.677054615010243
2019	3.6697497317509513
2020	3.663774876412039
2021	3.6337850929241577
2022	3.567200425910424
2023	3.546352038674981