Year	annual %
1961	0.17917576271833013
1962	1.3774523695724668
1963	2.4347574426823115
1964	2.342029815902549
1965	2.350316892953572
1966	2.5771780281645107
1967	2.430011095629297
1968	2.4853009078373844
1969	2.587522055206165
1970	2.592244413656971
1971	2.657539376396727
1972	2.3798200299477372
1973	2.25170845811067
1974	2.095328126089214
1975	1.8551076671415672
1976	1.6766539918821053
1977	1.5618412490838978
1978	1.5539456565452952
1979	1.5532087486412394
1980	1.4925387324732782
1981	1.5192465478462367
1982	1.6377461334165844
1983	1.607168406935756
1984	1.5028437270362218
1985	1.5099760739956736
1986	1.5668991202497011
1987	1.628992524871407
1988	1.6207600015720232
1989	1.565092663497623
1990	1.5125034804682258
1991	1.449550619392653
1992	1.3471525090131848
1993	1.2913340930248154
1994	1.2652571496990959
1995	1.217148087534099
1996	1.192757825751542
1997	1.157058289230278
1998	1.1029051693151075
1999	1.0112496943583977
2000	0.9440969820500698
2001	0.8974605718763655
2002	0.8439217822096907
2003	0.798496362173978
2004	0.763640198469858
2005	0.7495948852370447
2006	0.7450377810687172
2007	0.7330770020911501
2008	0.7281741314153294
2009	0.6998257373086005
2010	0.6848694624686402
2011	0.7143384831761637
2012	0.7989531071532952
2013	0.7798357469994528
2014	0.7499216481678701
2015	0.7143579297364226
2016	0.7066809497056994
2017	0.7102153770939452
2018	0.6123726150678408
2019	0.5327266542406193
2020	0.4281257771261693
2021	0.2656617364397533
2022	0.21070709863542447
2023	0.22703508948585238