Year	annual %
1961	4.294229873890161
1962	4.270520841121124
1963	4.17768411267265
1964	4.174611870704198
1965	4.213118991008684
1966	4.18874475106149
1967	4.165730370336594
1968	4.16082150133379
1969	4.140368652783659
1970	4.128281044290444
1971	4.113475978581663
1972	2.300727326994087
1973	1.9215014003658115
1974	1.9366977650612103
1975	1.9818962313850164
1976	2.0224187268343634
1977	2.061590170238036
1978	2.082008809508768
1979	2.097146751946692
1980	2.1083126477541083
1981	2.1217690149663815
1982	2.150324204497122
1983	5.669142132585823
1984	6.310041154873704
1985	6.264275537987974
1986	6.237652574779477
1987	6.195824427357268
1988	6.154889299835367
1989	6.078656622279052
1990	6.012488269668624
1991	5.901987911550005
1992	5.793736597744048
1993	3.823927513398114
1994	3.7739026966471405
1995	3.7365026828662073
1996	3.7155012114816905
1997	3.610913651263601
1998	3.575609244414049
1999	3.5581883618895125
2000	3.5487427661698048
2001	6.329288637106592
2002	6.166300561506395
2003	6.023122740742433
2004	4.191573670538399
2005	3.9393345096960046
2006	3.9204556755549356
2007	3.8541801564217195
2008	3.7940458859212813
2009	3.731972819861119
2010	3.2333856612134677
2011	3.1737117129384256
2012	3.54837939338699
2013	3.4662948162922196
2014	3.3972492992307215
2015	3.3326838281050715
2016	3.242233474576745
2017	3.151043155348401
2018	3.0615298867914564
2019	2.9750746607183327
2020	2.8848858669945603
2021	2.76011280334554
2022	2.659326047809415
2023	2.6105088643369014