Year	annual %
1961	3.3522267709880964
1962	3.804569241024055
1963	4.159124470072626
1964	4.1081605083554535
1965	3.0971214097690734
1966	3.1249902726493133
1967	3.104724667161875
1968	3.0979337445292003
1969	3.0933174453331276
1970	3.059792034837187
1971	3.08425145034505
1972	3.1287393076753602
1973	3.2114367846600658
1974	3.2804537912321194
1975	3.201844911565658
1976	3.1149996091753565
1977	3.0580699023589233
1978	3.3448074232090335
1979	3.6540914566925267
1980	3.6343273959172535
1981	3.6673164084622982
1982	3.627170305299444
1983	3.4207463764958987
1984	3.398883551166776
1985	3.3667546889928133
1986	3.355379758619108
1987	3.333147680647656
1988	3.2790438552025876
1989	3.152774809470472
1990	3.0442042389944106
1991	3.012201123003095
1992	2.882858623130886
1993	2.799982194780526
1994	2.7577217836604007
1995	2.7038219448951537
1996	2.6606476560451
1997	2.6344226620797
1998	2.601231682515845
1999	2.5392796964474655
2000	2.4878571732112533
2001	2.549446777469626
2002	2.608082408542046
2003	2.5782803949180533
2004	2.565819237179852
2005	2.536860991718399
2006	2.450047527461635
2007	2.3680771207666993
2008	2.375369602962124
2009	2.366120341489548
2010	2.3250947044301427
2011	2.28358651384697
2012	2.2941984796158295
2013	2.3121199523512956
2014	2.291936304558277
2015	2.2271600297449083
2016	2.148288417084146
2017	2.091470660018487
2018	1.9947934793894433
2019	1.8981427057599802
2020	1.7710829019081729
2021	1.6115423270610023
2022	1.3553936946930918
2023	1.4842038183758888