Year	annual %
1961	2.155171712785915
1962	2.120199940300978
1963	2.1186125872431347
1964	2.114243641218792
1965	2.0459708597937265
1966	1.9811193799933733
1967	1.9980954051731317
1968	2.0233258248306925
1969	2.0261998730052966
1970	1.9840805466835292
1971	1.8502561702567846
1972	1.7828265979333793
1973	1.8660702877723025
1974	1.842482748078453
1975	1.974710374839006
1976	1.7660836055898983
1977	1.76225915939321
1978	1.7622343500815418
1979	1.7778072113984393
1980	1.7932113612304477
1981	1.8765735835931423
1982	1.9881854031818023
1983	1.9038867013814382
1984	1.8452436414495992
1985	1.8128371893606214
1986	1.7985993771313389
1987	1.790378132406417
1988	1.7652106256313118
1989	1.7214368257966584
1990	1.7534610029017017
1991	1.73813466202688
1992	1.6498180745780928
1993	1.567131610212698
1994	1.4401940063496
1995	1.4324647799189023
1996	1.5295724560222794
1997	1.4871584637387087
1998	1.4071820908114603
1999	1.3591081685489854
2000	1.3384344817978047
2001	1.3333145869187462
2002	1.1945314672300782
2003	1.1318277787508748
2004	1.1010193737662775
2005	1.0403541424540208
2006	0.9856333365253249
2007	0.95378708599074
2008	0.8973288243313391
2009	0.8676484939432356
2010	0.8915724365307796
2011	0.8965494342210434
2012	0.8319006435066711
2013	0.7657176092371145
2014	0.7085551379977915
2015	0.6595725619065149
2016	0.6387770169483389
2017	0.6055024619542735
2018	0.565644880610634
2019	0.51751851585324
2020	0.45270600850260223
2021	0.3368588428726298
2022	0.25264349881982184
2023	0.3031118570855824