Year	annual %
1961	2.511460834971473
1962	2.5492940519092
1963	2.601809541726354
1964	2.6325416444833394
1965	2.6536170090933666
1966	2.6968304803113767
1967	2.7406845801043715
1968	2.736381959970501
1969	2.728846505233747
1970	2.7183850067802524
1971	2.6850697378686164
1972	2.66463155054673
1973	2.680841612688667
1974	2.7136418492678303
1975	2.888083691680592
1976	3.244318517181455
1977	3.1732483553520154
1978	2.7072379499309562
1979	2.7787123195615067
1980	3.08161014292601
1981	3.449040107820238
1982	3.4233808540439696
1983	3.1439013046766036
1984	3.186007819691696
1985	3.104107752030899
1986	3.0575997611810948
1987	2.9775320427789893
1988	2.829914996726842
1989	2.7717287510938178
1990	3.7657909754083647
1991	2.795481225025725
1992	2.503239236367108
1993	2.188770304304441
1994	2.0917476879128714
1995	2.142262932958232
1996	2.05573946178221
1997	2.032769198013071
1998	2.0077993944171055
1999	1.9850554596523011
2000	1.991058880348561
2001	1.9883736162469745
2002	1.8200710264897992
2003	1.7939792973124042
2004	1.94696055831119
2005	1.962044712628483
2006	1.934451227638732
2007	1.9175002231093714
2008	1.91708975716125
2009	1.9321411977519176
2010	1.9717211763460796
2011	1.8807402555560486
2012	1.8496603492438481
2013	1.984759857857739
2014	2.049524204830732
2015	1.990790685190575
2016	1.8292821910401216
2017	1.7018067191302748
2018	1.7282415040642292
2019	1.7280333995770576
2020	1.6164266520424206
2021	1.5145516432228305
2022	1.5025049767047705
2023	1.5386031885526847