Year	annual %
1961	4.5427512345758885
1962	4.567780841513411
1963	4.540824639205596
1964	4.508824271841206
1965	4.331107957094787
1966	4.259450732786945
1967	4.183637687849597
1968	4.114072813941803
1969	4.03958816536651
1970	3.969220751380419
1971	3.9370495985524485
1972	3.887920741697414
1973	3.8091237110753156
1974	3.755808777825692
1975	3.7046455277476724
1976	3.6449781095718947
1977	3.6335249891840107
1978	3.621866349171725
1979	3.5662541937186916
1980	3.4786683660629194
1981	3.308873907196542
1982	3.200282520250937
1983	3.170542719759652
1984	3.115289833349209
1985	3.0456245847202865
1986	2.9607461853892403
1987	2.8899333338340085
1988	2.842521090351326
1989	2.78529895588575
1990	2.755756774759078
1991	2.6800002997307644
1992	2.5796283250731307
1993	2.5071767652700174
1994	2.4797994839836264
1995	2.428494332096662
1996	2.3375044477398745
1997	2.305553541819492
1998	2.2545609962950124
1999	2.1814059222207334
2000	2.1224934765517105
2001	1.936170875200986
2002	1.8574482493667404
2003	1.7901629401743122
2004	1.729790983996395
2005	1.6905579911701238
2006	1.6410004735431585
2007	1.5949958934729551
2008	1.5456970692313092
2009	1.5101471118536836
2010	1.4454385781394734
2011	1.5413298070727706
2012	1.5152788852900443
2013	1.4695421099013828
2014	1.4383685769617074
2015	1.4132269865905158
2016	1.4016277794214034
2017	1.4182432931298052
2018	1.4415978881989986
2019	1.3975012122622132
2020	1.250223833007567
2021	1.0969786563741195
2022	1.0188750360620844
2023	1.0336226902446697