Year	annual %
1961	4.27785927352892
1962	4.286745662986874
1963	4.19963251266902
1964	4.094945495382078
1965	4.165802552335929
1966	4.233487421598394
1967	4.256687402189837
1968	4.237123446799011
1969	4.1997446254777255
1970	4.188130090431522
1971	4.143716323718322
1972	4.421123403813177
1973	4.377176263514928
1974	4.326833077639534
1975	4.3044728179371035
1976	4.273953959405176
1977	4.293374700266344
1978	4.338854802110938
1979	4.331337810855074
1980	4.362891271398279
1981	4.364972301809232
1982	4.318789175710574
1983	4.230953630901265
1984	4.097037134767331
1985	3.9575349538063533
1986	3.7602812182960363
1987	3.5482304040736357
1988	3.4294801215782282
1989	3.3146614947322295
1990	3.2448994015950654
1991	3.173106526264069
1992	3.1069659723971266
1993	3.0301947261968056
1994	2.9436052376594724
1995	2.2766544307458
1996	2.1291503276260495
1997	2.091977620640564
1998	2.055010925501809
1999	1.9990076642470698
2000	1.9474395869450225
2001	1.9183284894941157
2002	1.8860761765635323
2003	1.8231034155072652
2004	1.8460962628930193
2005	2.2842948276097435
2006	2.340857440064627
2007	2.306803370696354
2008	2.285321467535448
2009	2.2711605433018573
2010	2.2886969542181914
2011	2.3083784688174456
2012	2.3068650690504575
2013	2.2833035148654517
2014	2.23507317556878
2015	2.1666259404224495
2016	2.125203225233118
2017	2.0807538329953608
2018	1.9943831984291491
2019	1.9061080819999385
2020	1.903584018846942
2021	1.8869323492949812
2022	1.8488198994253957
2023	1.8242959997333381