Year	annual %
1961	3.1977298136932433
1962	3.5289757898591176
1963	3.5348962769346457
1964	3.5387188826711906
1965	3.4834853065817413
1966	3.4235302539920838
1967	3.4172462797472463
1968	3.4577856220849696
1969	3.4854150814264813
1970	3.4841283163387686
1971	3.559722003320914
1972	3.9939152001790177
1973	4.087716932257493
1974	4.173321745615539
1975	4.295818748742207
1976	4.284712371579346
1977	4.304138808236033
1978	4.331929262773599
1979	4.3660578993135175
1980	4.453790480588921
1981	4.160488188403576
1982	3.543897855156814
1983	3.561058400830632
1984	3.538879842827484
1985	3.5247985397008392
1986	3.5087928014789327
1987	3.4719235868295755
1988	3.4562905233821937
1989	3.4181277509934773
1990	3.360958734869797
1991	3.2532369221018627
1992	3.1213023272370037
1993	3.1340848989795234
1994	3.1158861423018323
1995	3.0523597247168652
1996	3.0045619021042143
1997	2.963043312981057
1998	2.928894764258331
1999	2.882716987878382
2000	2.858390370865436
2001	2.9810583543915072
2002	3.1745582095506535
2003	3.089693074820829
2004	3.0050601633362106
2005	2.917051298691618
2006	2.8208952002111545
2007	2.7332913832395462
2008	2.6875280443701826
2009	2.6792387821579666
2010	2.680249364322208
2011	2.6623440758991563
2012	2.619869452660396
2013	2.5629123429279304
2014	2.5205498496675887
2015	2.4693743902330283
2016	2.468597804785631
2017	2.4868860395053076
2018	2.475258262664525
2019	2.4494120188831516
2020	2.4414109887330966
2021	2.3576353339287834
2022	2.267234428368454
2023	2.374248279060879