Year	annual %
1961	2.4293110647921594
1962	2.4766181235178664
1963	2.4896651334386632
1964	2.5239607167244458
1965	2.556086271087324
1966	2.5525416046650093
1967	2.5857039088069627
1968	2.6268569941101845
1969	2.614615634901668
1970	2.5164099444274086
1971	2.2311052045455853
1972	2.2795134802534562
1973	2.550409741476628
1974	2.573735635664491
1975	2.4812555407254706
1976	2.380914046839351
1977	2.403376026565468
1978	2.5777918164504428
1979	2.648009772274108
1980	2.3549999818428944
1981	2.2298719796613966
1982	2.527315842063743
1983	2.7165323084536084
1984	2.72445978265894
1985	2.6847292462485797
1986	2.604045121164205
1987	2.5734171991325496
1988	2.508190371469098
1989	2.5156661738870554
1990	2.491963066390099
1991	2.445918823836294
1992	2.6817878457113125
1993	2.8384224595021834
1994	2.6910977284512825
1995	2.583770837652068
1996	2.534331104809823
1997	2.4739532809577867
1998	2.4685405742063153
1999	2.500303902416576
2000	2.4392778719014814
2001	2.4283722526180327
2002	2.59874357072664
2003	2.615552289275527
2004	2.4964869334054924
2005	2.476121918644523
2006	2.449118267412345
2007	2.357854208297155
2008	2.330868669067172
2009	2.37012399813122
2010	2.4064387777939658
2011	2.445886443414082
2012	2.4591343619902943
2013	2.4587103119338707
2014	2.4554817308977306
2015	2.4253456736507815
2016	2.452861057227352
2017	2.4644595282278914
2018	2.4234507250404675
2019	2.4145532198879067
2020	2.4388213326665777
2021	2.406415210438368
2022	2.3303719393135083
2023	2.3078836943783045