Year	annual %
1961	2.185217368105765
1962	2.2070073587952455
1963	2.2248729447211657
1964	2.2405200216570655
1965	2.252639258834086
1966	2.257991353925471
1967	2.257118490753887
1968	2.2645014919904614
1969	2.250773078552629
1970	2.3277190027288714
1971	2.4869069586872903
1972	2.523275928921324
1973	2.6337474161432635
1974	2.771861710676175
1975	2.875789501540227
1976	2.939155728694207
1977	2.9564779671085
1978	3.0288836739674765
1979	3.052884485588381
1980	3.050533893690639
1981	3.0391774424617894
1982	3.0175698638805573
1983	2.9965170999539414
1984	2.971306571176191
1985	2.945736485891431
1986	2.862240897346572
1987	2.882232681584016
1988	2.8786220915403593
1989	2.8256341461553003
1990	2.7887279639920806
1991	2.7488791745537027
1992	2.713236396818409
1993	2.6847205220412955
1994	2.6664953117199186
1995	2.6525343797856427
1996	2.618072424505035
1997	2.5613583068699763
1998	2.5095357378529415
1999	2.430032789389827
2000	2.156031639228827
2001	1.9318470158445744
2002	1.8524168804443568
2003	1.8077545136837792
2004	1.7679549295583903
2005	1.7342136888976165
2006	1.7220074816495061
2007	1.7086995345844795
2008	1.6828688402985916
2009	1.7078062884154426
2010	1.779398069401611
2011	1.8592175266934248
2012	1.9213814201831783
2013	1.951841273810639
2014	1.953702410933458
2015	1.9305598403878517
2016	1.8911059930130345
2017	1.8410199207264593
2018	1.7918248733869924
2019	1.7536369632541473
2020	1.7626014442941047
2021	1.7718917565907735
2022	1.6826143938784965
2023	1.5948949121484435