Year	annual %
1961	4.977924144750992
1962	5.151809913298357
1963	5.090493413116328
1964	4.9673206983309806
1965	4.743085245690822
1966	4.4962847098576315
1967	4.3024049151370996
1968	4.283800065484673
1969	4.57405623262231
1970	5.239910441665938
1971	6.828401226283817
1972	8.124045276966116
1973	8.364953419409051
1974	8.37704005763939
1975	8.290470249946415
1976	8.190917918758545
1977	8.155695536841295
1978	8.185562494007854
1979	8.158929611597902
1980	8.162664982362516
1981	8.135502659934374
1982	8.107921698258211
1983	8.060042644387318
1984	7.984212930428869
1985	7.8903892317262665
1986	7.777434340332924
1987	7.571054097210128
1988	7.422788734156556
1989	7.3334062648280645
1990	7.223496730111259
1991	7.119319907782441
1992	6.96083748230215
1993	6.7719986389279825
1994	6.722597969195913
1995	5.971988064054949
1996	5.960013043533146
1997	5.901940058382517
1998	5.794187303451232
1999	5.683946642373373
2000	5.64866955326432
2001	5.627442315959186
2002	5.623762278684338
2003	5.645138172733509
2004	5.685844962864316
2005	5.67454748217163
2006	4.947079621342536
2007	4.969582617303818
2008	4.980011828324434
2009	4.975504408741761
2010	4.99558074843681
2011	4.997269200353197
2012	4.973863779592215
2013	4.926418528536574
2014	4.853339659723789
2015	4.7510194699362644
2016	4.68814539911162
2017	4.620862290160105
2018	4.500115170526172
2019	4.402191143657487
2020	4.24277826050856
2021	4.111785846590537
2022	4.0130857388092664
2023	3.918632481655403