Year	annual %
1961	6.480530807167555
1962	6.327740552871694
1963	6.284729840212427
1964	6.244909910158202
1965	6.0709701540054475
1966	6.556663988694138
1967	6.364284164396997
1968	6.181885333494349
1969	7.006909988746174
1970	8.96448361144912
1971	8.428604470737946
1972	5.987616182740148
1973	3.839169226765375
1974	3.3804749065807465
1975	2.569182562221297
1976	2.4006992198919916
1977	2.1746593047813256
1978	1.7861896673984836
1979	1.4073428194665387
1980	1.78898789660326
1981	2.509739202521998
1982	2.7790527070531015
1983	2.612032338102916
1984	2.2224399351670465
1985	2.0861193961127684
1986	2.116780727322665
1987	2.236343032757194
1988	2.1987610395460178
1989	2.213977167970907
1990	2.6089734099109747
1991	2.816105527942861
1992	2.7380392353715313
1993	2.8160295490035767
1994	2.903115248346671
1995	2.4973786581361614
1996	2.2249939350102945
1997	2.5305462435733626
1998	2.490377243886235
1999	2.48500518021262
2000	2.4845998586530804
2001	2.4768350084253985
2002	2.4688828104582545
2003	2.268556578378761
2004	2.0823625517232913
2005	2.498664675380633
2006	2.542146512962461
2007	2.5021637240102272
2008	2.462314453998784
2009	2.2976177536009708
2010	2.247800922665787
2011	2.5131021877410706
2012	2.4883910358986747
2013	2.4462502536662045
2014	2.3131754186846987
2015	1.1724044017951887
2016	0.9163604838508119
2017	0.839210055478929
2018	0.7388802791009288
2019	0.6194546675885376
2020	0.521808218823864
2021	0.31260566877314444
2022	0.11922260063540943
2023	0.06828339413006976