Year	annual %
1961	4.567287883291547
1962	4.590517245765429
1963	4.445533803135274
1964	4.354505173883378
1965	4.352931634455014
1966	4.339415265597827
1967	4.317404075441728
1968	4.306288167660379
1969	4.274054288925258
1970	4.2481083699637265
1971	4.207432687417266
1972	4.1806678243020805
1973	4.148518179616339
1974	4.170011361532203
1975	4.9395883912781855
1976	4.888342925944631
1977	4.824423165064005
1978	4.768436998450752
1979	4.708907999912962
1980	4.651124135515825
1981	4.584101392336895
1982	4.523286943918543
1983	4.277131171296462
1984	4.107714443045185
1985	4.060250266718487
1986	4.023602598651306
1987	3.971567658675512
1988	3.9026899413177523
1989	3.8140886247678494
1990	3.731319313224196
1991	3.3547711283702286
1992	3.034364987683198
1993	2.893179509374419
1994	2.8130696498649503
1995	2.7588428741942805
1996	2.7108141520421785
1997	2.657443804067241
1998	2.608889711775558
1999	2.5737903685989085
2000	2.550757610627123
2001	2.545469734793412
2002	2.2604075886735195
2003	2.0721308827727616
2004	2.0619822695317986
2005	2.0441669739827093
2006	2.0382179284111577
2007	2.0358565580621346
2008	2.019309249504699
2009	1.9949911293092228
2010	1.9718471803553264
2011	1.8983669889540606
2012	1.8202626404071127
2013	1.7496930405962587
2014	1.6988145610591625
2015	1.696160574945962
2016	1.7076780652761736
2017	1.7671831661763635
2018	2.1277909368757117
2019	2.1678811836171064
2020	1.6828266876288351
2021	1.4855048967471338
2022	1.4598027641498947
2023	1.3903461423366121