Year	annual %
1961	10.207659611135615
1962	9.998811709203524
1963	9.895979877132019
1964	9.831093224356312
1965	9.740940927956302
1966	9.795945706040234
1967	15.087927954272255
1968	14.997619793915645
1969	14.91319826520677
1970	14.816575983581911
1971	14.690747986501298
1972	4.36353257951326
1973	4.141718902348671
1974	4.071635742831999
1975	4.014057012955555
1976	3.975369036604211
1977	3.9254085200779714
1978	3.8990207535738577
1979	3.856360032453654
1980	3.824795139075094
1981	3.5329131839602157
1982	3.4618481284951064
1983	3.4830381673283903
1984	3.505843321059068
1985	3.5245632421614173
1986	3.5450522145918297
1987	3.5524943848654718
1988	3.5523251874161255
1989	3.6446012090468307
1990	4.007351510806084
1991	2.0143828663199295
1992	2.3142711275875594
1993	2.4114076271082032
1994	2.387864377065815
1995	2.3566356597141174
1996	2.3183088676320986
1997	2.3007452907302466
1998	2.2497174388325476
1999	2.1983902341360904
2000	2.1653989956743334
2001	3.2277601161514164
2002	3.2128489399112725
2003	3.1744186256588676
2004	3.1209350674783645
2005	3.0783690244068778
2006	3.0339249120294633
2007	2.9860364852927033
2008	2.9482903488212844
2009	2.909827651545327
2010	2.865434886352037
2011	2.7569400326410842
2012	2.63940734576892
2013	2.6620286818405066
2014	2.692745714892976
2015	2.727790966396828
2016	2.7602877877578402
2017	2.7917856989411005
2018	2.8353545619456377
2019	2.873345696352169
2020	2.862051355354617
2021	2.856909649354379
2022	2.855110076603646
2023	2.862656733640802