Year	annual %
1961	3.8535586530738173
1962	3.7991753805788826
1963	4.089856252845129
1964	5.105166341395093
1965	4.97663480311213
1966	4.8456812221207315
1967	4.705223892946247
1968	4.5341841105376925
1969	4.398652053731757
1970	4.3129964150260705
1971	4.226886412512261
1972	4.1604053101939495
1973	4.013948142087787
1974	3.4082252331317093
1975	3.4142501823724642
1976	3.443460304784767
1977	3.475651674762908
1978	3.514600208406462
1979	3.5448370990655684
1980	3.5511759979210913
1981	3.549752501542068
1982	3.5693836522925264
1983	3.5767526223568105
1984	3.6406719231804967
1985	4.76022549296833
1986	4.697179163983459
1987	4.605557045434834
1988	4.507577238430991
1989	4.425931101345411
1990	4.386157089679557
1991	4.34871732825108
1992	4.296707561904582
1993	4.222892742147832
1994	4.141121065777849
1995	4.048837673643358
1996	3.953711381953165
1997	3.8592710071489478
1998	3.7480254613065416
1999	3.6194843373357775
2000	3.500786609426771
2001	4.116918185237692
2002	3.8965411854064276
2003	3.7140608728822153
2004	3.573229195343279
2005	3.447049130355416
2006	3.337772794536585
2007	3.2368925063305354
2008	3.1524901420575837
2009	3.0437180168751943
2010	2.919069248713647
2011	2.8056904996673735
2012	2.672143798437205
2013	2.5285730574344774
2014	2.3818158371398166
2015	2.251827420832913
2016	2.1448654793290243
2017	2.0344148426397144
2018	1.922588528095821
2019	1.7885179241658011
2020	1.6199445225278835
2021	1.406834717935002
2022	1.2749453068970342
2023	1.3076481391174137