Year	annual %
1961	3.5399593084111274
1962	4.073553469417249
1963	4.4838828057662
1964	4.433866289997738
1965	3.321158861803326
1966	3.4419967940166174
1967	3.4320293790581076
1968	3.4423708035464813
1969	3.45586199709615
1970	3.4298512494231375
1971	3.4835928463455446
1972	3.525555737653889
1973	3.6357688755670523
1974	3.7165839668093383
1975	3.3882175831520414
1976	3.533755118848376
1977	3.47574787115002
1978	3.8004338274172085
1979	4.1480110181745715
1980	4.18596168875041
1981	4.214803233910487
1982	4.080159622116113
1983	3.854017209360407
1984	3.80419153303761
1985	3.7751736377942535
1986	3.7704930755736683
1987	3.7434686886074644
1988	3.6849357965437406
1989	3.5844593851597892
1990	3.645915226625675
1991	3.458577375665925
1992	3.309190885873207
1993	3.2139662805659412
1994	3.1659870284955787
1995	3.1022587284759595
1996	3.0616312976526388
1997	3.0238159159854376
1998	2.978130265083294
1999	2.9127138617926533
2000	2.8896761548671464
2001	2.985595603360025
2002	3.0295569906891444
2003	2.971985810932651
2004	2.9457366027641143
2005	2.904110304838909
2006	2.806021681677933
2007	2.7202373232967574
2008	2.715495958864153
2009	2.6978740844246545
2010	2.6720759538844163
2011	2.6159992898669344
2012	2.5979050488576405
2013	2.6007223517294733
2014	2.574822024717946
2015	2.509158944050924
2016	2.433991925445781
2017	2.3928849168380424
2018	2.323102832584638
2019	2.2341149221524574
2020	2.119444191001236
2021	1.9837738297799916
2022	1.7567855146993168
2023	1.8339939910835454