Year	annual %
1961	1.3202836258953852
1962	1.503422925180601
1963	1.468462017288914
1964	1.38525472443429
1965	1.3031621837292988
1966	1.1795128356900477
1967	1.095756400730437
1968	1.0282605694824838
1969	1.0271298424790558
1970	1.050377693759799
1971	1.0397999987739865
1972	0.8947342432685588
1973	0.8249983589227412
1974	0.6256965137493751
1975	0.6324741746983449
1976	0.7311412239085797
1977	0.8411304507413178
1978	0.8235491175684331
1979	0.8721885895368615
1980	0.9183947206476688
1981	0.9611612520140653
1982	0.8753862318074681
1983	1.0177986102915213
1984	1.0095419090529134
1985	1.0448274367692392
1986	1.0282254659973233
1987	0.9567742405956636
1988	0.9617430198505303
1989	0.9551212309999926
1990	0.9741156291897681
1991	1.1483058779816417
1992	0.590688628177773
1993	0.4751320332007509
1994	0.5955557313274511
1995	0.5876692722699204
1996	0.8767804765130904
1997	0.9472640475681118
1998	0.9926634453182999
1999	1.0542448604191463
2000	0.9871922828733801
2001	0.8863560309712426
2002	0.9288692672233338
2003	0.8865290240028969
2004	0.9045235624041652
2005	0.9389583462472189
2006	0.9713937091576383
2007	0.9852093850766721
2008	0.9087592757064442
2009	0.8474934454733472
2010	0.7972047769722934
2011	0.7070826531811747
2012	0.7229044106842366
2013	0.7425585263934238
2014	0.7614163199536108
2015	0.7597937931980567
2016	0.7007290367712926
2017	0.676791355237711
2018	0.7661345123593435
2019	0.6056292886258205
2020	0.4220739269899809
2021	0.46941327536865174
2022	0.5166496926409394
2023	0.40428547478722976