Year	annual %
1961	0.09977158387957447
1962	-0.2294482865342719
1963	-0.42877793875738474
1964	-0.5899305308469601
1965	-0.6772215468428183
1966	-0.6656789608597825
1967	-0.5779998625656558
1968	-0.4815098997844507
1969	-0.4400887278983418
1970	-0.3395712984544069
1971	1.1165985549973807
1972	1.4987671398603706
1973	1.4906778839822705
1974	1.5379425492358254
1975	1.6439477820846828
1976	1.8095619543149148
1977	1.949482617256758
1978	2.0342211906169445
1979	1.9606290487305902
1980	1.7220828000335637
1981	1.4310525509626293
1982	0.28468144820979624
1983	0.04711496899295432
1984	0.09112725031451357
1985	0.2607721542037187
1986	0.3974285742797629
1987	0.5549595768458007
1988	0.6711484748187292
1989	0.5837676166886259
1990	0.4403926310189388
1991	0.198870188621719
1992	0.28656051704299057
1993	0.22426628183750114
1994	0.1097510225549992
1995	-0.020477715928621236
1996	-0.1493214934377171
1997	-0.2743365201548821
1998	-0.4195594162558754
1999	-0.5621649221244438
2000	-0.6997095734363448
2001	-0.3127270378965623
2002	-0.19501371275920726
2003	-0.18035083115622783
2004	-0.3013094163825563
2005	-0.3854909194806104
2006	-0.4691244797511155
2007	-0.5447525850457682
2008	-0.6416280627512765
2009	-0.7682892041090768
2010	-0.9432781963033601
2011	-1.1026164696735092
2012	-1.2190706081339642
2013	-1.2454787117393868
2014	-1.3006506781368508
2015	-1.3511257780282
2016	-1.396675437419465
2017	-1.4267471657540567
2018	-1.4473982344199057
2019	-1.4386468194899402
2020	-1.0378782256836627
2021	-0.8219445130399843
2022	-0.8777214066843779
2023	-0.7501582827708888