Year	annual %
1961	3.595089547162985
1962	4.109133205421898
1963	4.507282413579716
1964	4.4623693483850815
1965	3.3980192069897868
1966	3.5171514756276565
1967	3.513778006504097
1968	3.54469013569701
1969	3.572629447092865
1970	3.54367637715076
1971	3.5381111115225963
1972	3.5778172698173023
1973	3.6787206399948786
1974	3.7461389303554427
1975	3.4310364796337467
1976	3.5555323372038856
1977	3.497901736975379
1978	3.816043262804982
1979	4.149219224354653
1980	4.164694705673384
1981	4.178956453734514
1982	4.06485431098011
1983	3.8719081969959177
1984	3.8395937637381934
1985	3.8191020708251813
1986	3.80958963054195
1987	3.781224671668369
1988	3.7209413000375946
1989	3.6228289538841665
1990	3.670700263420244
1991	3.478541627009264
1992	3.3599653326413375
1993	3.2822429862537206
1994	3.2236915253632645
1995	3.15237812378264
1996	3.0954154647670435
1997	3.0601042442474977
1998	3.016655831082815
1999	2.956450953865925
2000	2.9305947371212966
2001	3.023046147696334
2002	3.0782800365674774
2003	3.0240856286198863
2004	2.9934876509574337
2005	2.9607561260706774
2006	2.8804573040476384
2007	2.787264261877894
2008	2.8007351184202207
2009	2.779142495508367
2010	2.7580192011304376
2011	2.692313568463888
2012	2.661266369929521
2013	2.6474600426413986
2014	2.6232402172706344
2015	2.5861895871656486
2016	2.5315807314157297
2017	2.5013266426164478
2018	2.4417189469421174
2019	2.3679041552475724
2020	2.2621484848628626
2021	2.132404814124726
2022	1.924920459517736
2023	2.0059344983903884