Year	annual %
1961	3.807034114112383
1962	3.6849231870115484
1963	3.645268269527809
1964	3.6157911038938293
1965	3.5858871953575364
1966	3.539143973878456
1967	3.5014083988173237
1968	3.4763246459920536
1969	3.415524339042576
1970	3.5287723261073802
1971	4.146728086501036
1972	4.0835835873354815
1973	4.0103614942992865
1974	3.9131718466737393
1975	3.82072399212639
1976	3.5143817546093614
1977	3.652283397520516
1978	3.736229202375776
1979	3.699319143640799
1980	3.8809900452677604
1981	5.041967302776109
1982	4.944738667188258
1983	4.887346005457283
1984	4.818914210149834
1985	4.7170312944572155
1986	4.625893645431358
1987	4.549092890827682
1988	4.519256874404909
1989	4.472537050657507
1990	4.100584191406403
1991	2.1960406832104296
1992	2.1738953418527998
1993	2.175928581320732
1994	2.1614548935390197
1995	2.1554415674254743
1996	2.2347305546022356
1997	2.2865346086186915
1998	2.225623233172025
1999	2.14771404122818
2000	2.0327222592416825
2001	1.9324569624263297
2002	1.8779241141158471
2003	1.8332194644300668
2004	1.8016877652892653
2005	1.7499725322917283
2006	1.6978921895599024
2007	1.6838738394853923
2008	1.6836088035082408
2009	1.655072885238702
2010	1.715649639276744
2011	2.199913066568855
2012	2.160037149162127
2013	2.1039181306070884
2014	2.0299031035028294
2015	2.0833532851951513
2016	2.1856451397441305
2017	2.205434066029744
2018	2.1810746952948326
2019	2.1697711565895377
2020	2.1744518199897067
2021	2.0750507068673745
2022	2.0758972092785433
2023	2.17126141234698