Year	annual %
1961	2.517892571861651
1962	2.548712297625073
1963	2.5631834365046586
1964	2.596033653711146
1965	2.62650515428804
1966	2.6273547411778964
1967	2.6588407836324706
1968	2.694839588604566
1969	2.676146752237969
1970	2.5775541086122047
1971	2.3150032164352012
1972	2.349299342262796
1973	2.583325967664834
1974	2.603381145813131
1975	2.521643921050341
1976	2.4268753718181415
1977	2.4400661107637234
1978	2.5945489300395934
1979	2.655735355902806
1980	2.3896265111253996
1981	2.2721893608406845
1982	2.5302745802696194
1983	2.6954979573342968
1984	2.6895479417319734
1985	2.6388315579902297
1986	2.567473662283163
1987	2.5442082472741987
1988	2.4885851678000392
1989	2.500753801343734
1990	2.47621608863669
1991	2.426373999076233
1992	2.6167909678488996
1993	2.7378271953738818
1994	2.6075009325448946
1995	2.5162455784412288
1996	2.4702049839530105
1997	2.405800870614243
1998	2.3700596892864922
1999	2.379568475465206
2000	2.3463270778222522
2001	2.358674426854293
2002	2.5128227854801253
2003	2.520989956231915
2004	2.410420532035346
2005	2.3891151706608724
2006	2.403436825504727
2007	2.3650264157010668
2008	2.276088498145114
2009	2.260881322887954
2010	2.306202520641591
2011	2.327499440775526
2012	2.284626159968269
2013	2.1849523627332132
2014	2.161452116845666
2015	2.200698776343586
2016	2.2908917067418884
2017	2.326475380457623
2018	2.3276950835688694
2019	2.3516473888838334
2020	2.3619801976342245
2021	2.336157562248303
2022	2.266542071758579
2023	2.2505611456576986