Year	annual %
1961	2.454790212637363
1962	2.4609491884681063
1963	2.4754054919083472
1964	2.4724761271853737
1965	2.4387772140958646
1966	2.3911299316461907
1967	2.3764481728301377
1968	2.3968770040670364
1969	2.4090614536623605
1970	2.3836883204172494
1971	2.2968727003613196
1972	2.32183551831271
1973	2.4198693961889717
1974	2.4218965825813115
1975	2.398588924617755
1976	2.3998337131543366
1977	2.434880070878947
1978	2.418571899704247
1979	2.440378534119162
1980	2.560515642856089
1981	2.6145614662969905
1982	2.5770647403789297
1983	2.5319146420616647
1984	2.4984427500918542
1985	2.4937077335131193
1986	2.4834791393284092
1987	2.4504741565812793
1988	2.4170657208701414
1989	2.3888113930980808
1990	2.4835622288021995
1991	2.3177052081318834
1992	2.239369941977884
1993	2.2195211538098505
1994	2.208888751577831
1995	2.1596803302433187
1996	2.1099789642118765
1997	2.076415168508163
1998	2.0516898074737213
1999	2.0157612947839993
2000	2.0130789810979763
2001	1.9990802492049227
2002	1.9351774101537842
2003	1.877568230005437
2004	1.8473514532875583
2005	1.7939418907890285
2006	1.7407240108958604
2007	1.7098096721791336
2008	1.6703891706022063
2009	1.6590409845301792
2010	1.6902846067563928
2011	1.6874605601164774
2012	1.6384738943294792
2013	1.6290717165170747
2014	1.6106994749277135
2015	1.5484634358945897
2016	1.5206465232550812
2017	1.5015180965735482
2018	1.4651434925225857
2019	1.422508464585718
2020	1.4037331602965821
2021	1.3333599287939109
2022	1.2491182700874077
2023	1.2974946013751634