Year	annual %
1961	2.851373809875938
1962	2.857753115862657
1963	2.6877233506686755
1964	2.658059576437885
1965	2.6165555359095585
1966	2.5801255718420553
1967	2.4529674815838654
1968	2.39177703116518
1969	2.3196483089944384
1970	2.25341762997887
1971	2.1664723515325237
1972	2.1049627693008626
1973	2.0828089070313913
1974	2.0617254688863085
1975	2.067192493338951
1976	2.073296769579885
1977	2.088167970688947
1978	2.459822306140603
1979	2.7580232415736123
1980	2.817482850605503
1981	2.833494697747355
1982	2.8162412540990953
1983	2.7785664869447713
1984	2.7580302070706053
1985	2.7574949219216736
1986	2.759012596269039
1987	2.7639710296124607
1988	2.7848628455844464
1989	2.9558536067814702
1990	2.995168897891315
1991	3.0093086040087407
1992	3.0181210949118356
1993	3.0581712465423285
1994	3.1177712119798926
1995	3.223965758629361
1996	3.2691790754343106
1997	3.238037293893144
1998	3.2807813406456625
1999	3.311234571946163
2000	3.324760898319102
2001	3.3682021594936105
2002	3.478128654075637
2003	3.509242387139269
2004	3.5539537723749293
2005	3.594146389149614
2006	3.6192012609931745
2007	3.6459794701598076
2008	3.6785186845502684
2009	3.7059407054335676
2010	3.735479540740648
2011	3.752691493129695
2012	3.81535012877382
2013	3.8229798638131682
2014	3.768046699499098
2015	3.795435453506114
2016	3.815734387020595
2017	3.755233989527512
2018	3.697894443552378
2019	3.6553058041099296
2020	3.596447889974199
2021	3.5573875313810572
2022	3.541062405549051
2023	3.5330561982384565