Year	annual %
1961	4.560089644887739
1962	4.553221675470937
1963	4.51586623373484
1964	4.477232297367124
1965	4.308352140204548
1966	4.235493368790543
1967	4.158810446788053
1968	4.088978637240984
1969	4.012235449566234
1970	3.9400457368465
1971	3.8730699664986616
1972	3.8163264897719102
1973	3.744986724978233
1974	3.700999132751903
1975	3.659031018850129
1976	3.6102464197800685
1977	3.601266909304428
1978	3.592506299975156
1979	3.5409482937460695
1980	3.4577322507562513
1981	3.2925657296739104
1982	3.1831424524087595
1983	3.1319164191954627
1984	3.0779377265413217
1985	3.0136265804471947
1986	2.937385489815881
1987	2.8724051169310343
1988	2.8258512340191544
1989	2.7700031057700727
1990	2.7403709068600506
1991	2.676338902626668
1992	2.589832926813429
1993	2.5269441775964054
1994	2.4975077803310484
1995	2.44486842036207
1996	2.3552040321540346
1997	2.3193780574942053
1998	2.2654376674889676
1999	2.191593605186256
2000	2.1311549967231826
2001	1.9494358924023345
2002	1.854501104474295
2003	1.7838462881794896
2004	1.7260397284949818
2005	1.6880066678709227
2006	1.6403942034133934
2007	1.5957052528042794
2008	1.5473878847139417
2009	1.5114395296144494
2010	1.4487695222881598
2011	1.5335338753326653
2012	1.506085729325207
2013	1.4623195012433143
2014	1.432627457064541
2015	1.4065050465651865
2016	1.3787836388686117
2017	1.337050205705708
2018	1.2712050447413787
2019	1.2126745856134988
2020	1.1294652736630013
2021	1.0159785440676927
2022	0.9975860540730253
2023	1.0673732962654725