Year	annual %
1961	4.412342756590445
1962	4.52866274252118
1963	4.5460057214703
1964	4.538709888260096
1965	4.495444751079533
1966	4.4496337970559265
1967	4.398786820870332
1968	4.335266061164541
1969	4.26867981313244
1970	4.095975611607074
1971	3.373115833895932
1972	3.3390596076530983
1973	3.283788769111225
1974	3.2186867889064628
1975	3.1512274001446787
1976	3.085044540796894
1977	3.0132827557705717
1978	2.958637410834703
1979	2.915019786884922
1980	2.907837643900749
1981	2.998332391613673
1982	2.994076466950171
1983	2.9871566136892125
1984	2.970191590529667
1985	2.9286008068221987
1986	2.893615957507338
1987	2.854522094914311
1988	2.8180903862815105
1989	2.770854828587349
1990	2.8777405877315436
1991	3.6752133955240485
1992	3.6142130678959057
1993	3.569817295039826
1994	3.531125031739593
1995	3.489168428338903
1996	3.4535278764536033
1997	3.409796731419063
1998	3.371980516453519
1999	3.330120263866645
2000	3.1801621810310308
2001	2.435581158767918
2002	2.4141584055321212
2003	2.395515524189516
2004	2.388902979430885
2005	2.374734918744824
2006	2.3396017894628156
2007	2.309558342815513
2008	2.291459702460748
2009	2.266122795674523
2010	2.234293771156876
2011	2.234360518263364
2012	2.2419327926750836
2013	2.2325530111970386
2014	2.2259204374140253
2015	2.229713973988944
2016	2.2295961817376164
2017	2.21997026314659
2018	2.1844861536224176
2019	2.1178604371335905
2020	1.9712984320118434
2021	1.8419042302204063
2022	1.8393356089382795
2023	1.8759099423042835