Year	annual %
1961	3.1234308520114524
1962	3.7716228013499773
1963	4.400082382021964
1964	4.3194077273622185
1965	2.615812148241133
1966	2.7129468760386715
1967	2.713661747678458
1968	2.7368564623511276
1969	2.7688485564271446
1970	2.738189638202897
1971	2.6750187118601616
1972	2.569523006366097
1973	2.7163930353018912
1974	2.8431957434707584
1975	2.7078701606980218
1976	2.574240327981542
1977	2.497001827009342
1978	3.0279498378062044
1979	3.6021608553707978
1980	3.5633752882493894
1981	3.5355897469142974
1982	3.575853324960306
1983	3.2377740406473805
1984	3.198695685855995
1985	3.1866444321330363
1986	3.204473793233035
1987	3.2272034329240427
1988	3.1918249242070402
1989	3.0193852385457944
1990	2.792595931296276
1991	2.925783925317063
1992	2.8825707704275487
1993	2.770984691303994
1994	2.7279814118964083
1995	2.6588437538396903
1996	2.635636058072933
1997	2.6224109844854127
1998	2.58191615883068
1999	2.50968280815016
2000	2.4429861823622048
2001	2.6503154943075202
2002	2.7221836300450093
2003	2.692418502519999
2004	2.667762300012356
2005	2.65817250837641
2006	2.6028449191857703
2007	2.559304556272423
2008	2.547341044546897
2009	2.4978150351295767
2010	2.4082639624270143
2011	2.3068264428647467
2012	2.3334486556160385
2013	2.3164975894358406
2014	2.259974859229928
2015	2.167232705893369
2016	2.1137213527501046
2017	2.090912941704886
2018	1.9537369756797744
2019	1.8182542206868249
2020	1.634520098641019
2021	1.4428275446433787
2022	1.2847107370378836
2023	1.2146098177670837