Year	annual %
1961	4.590573883680876
1962	4.529851224512541
1963	4.690047746924654
1964	4.733523004481242
1965	4.677367861476514
1966	4.725361378131571
1967	4.9086069888905755
1968	6.8366297730283545
1969	7.863833327439496
1970	7.542998347935055
1971	3.4550975749997175
1972	3.396704706666124
1973	3.1557491690338355
1974	2.7888886759673426
1975	2.6086938245580686
1976	1.6363446533811907
1977	1.4979090987671277
1978	1.4576528227798904
1979	1.4745928605688186
1980	1.4962848600151952
1981	1.7062259802419912
1982	1.7138083439488552
1983	1.7033078464396783
1984	1.7075072835571872
1985	1.7200337404182073
1986	1.7333929715204062
1987	1.7278453464919252
1988	1.7192796167677666
1989	1.7166818163003916
1990	1.7288992203642557
1991	1.7593515991311994
1992	1.7774312700847432
1993	1.7915583798974934
1994	1.7061663812823928
1995	1.3940495411154619
1996	1.1507170368613113
1997	1.0711706048142962
1998	0.9895118788474032
1999	0.915710723095582
2000	0.8294866907420891
2001	0.753462281030614
2002	0.6666896804855037
2003	0.7352284958861145
2004	0.8330476908443738
2005	0.7634039799809
2006	0.6896782904432823
2007	0.6271401021830445
2008	0.5909929945414435
2009	0.7163812717783339
2010	0.7278386739207803
2011	0.6912683751959143
2012	0.7171233667203892
2013	0.7531206282710303
2014	0.7910270775281188
2015	0.8160565225122538
2016	0.8357498421013231
2017	0.8339952588171822
2018	0.8339911196790685
2019	0.8353795449405294
2020	0.8307579085718682
2021	0.8204649979574364
2022	0.8111847806559009
2023	0.8051352782912821