Year	annual %
1961	0.515650334937277
1962	1.5986814468074186
1963	2.549326392673663
1964	2.46556985532726
1965	2.4578117140426627
1966	2.670676715840983
1967	2.55379161450972
1968	2.5686086352461217
1969	2.6295767453361947
1970	2.6222362422060996
1971	2.6011885153736074
1972	2.4266605187054324
1973	2.3178759565726494
1974	2.1808032397272967
1975	2.0043809060949656
1976	1.8751038984890158
1977	1.7592390625317478
1978	1.7394607674743838
1979	1.7332209200189368
1980	1.6833546669475083
1981	1.7148365806221193
1982	1.8106782964690638
1983	1.7713659085278408
1984	1.6903385699063875
1985	1.693284216098661
1986	1.749507928861064
1987	1.79928058018821
1988	1.7782300772428101
1989	1.6963484918758809
1990	1.6659267476792081
1991	1.5768436837701358
1992	1.4322982830031918
1993	1.327505796410989
1994	1.2799454212256904
1995	1.2409871163314534
1996	1.2172604184019065
1997	1.1907274928882714
1998	1.1355836147962464
1999	1.0651636579258223
2000	1.0153014490341405
2001	0.9736200693553769
2002	0.9120435761426222
2003	0.8719458932866502
2004	0.8658985106257688
2005	0.8581251806778312
2006	0.811990009935414
2007	0.7586535748634731
2008	0.8020751760301863
2009	0.8146669642139273
2010	0.7917904639802771
2011	0.8293510413478486
2012	0.909504727453438
2013	0.9217158864037032
2014	0.8942556198844613
2015	0.8728643020425864
2016	0.8223663073198679
2017	0.8084877597985809
2018	0.7509400124858985
2019	0.6745006718124671
2020	0.5481771973380773
2021	0.413227733962259
2022	0.13621802515559978
2023	0.2617800998560398