Year	%
1961	3.1078848748441743
1962	3.215345975872068
1963	3.374882242405081
1964	2.9516689997086836
1965	2.5659131262605226
1966	2.6494206288345064
1967	2.4062270318362655
1968	1.8639112466839627
1969	2.851773364219036
1970	2.514918207676119
1971	0.6219920275612227
1972	0.8839652181244488
1973	2.409693847438143
1974	1.6510659666039944
1975	-1.2815805405059535
1976	1.2667903810319
1977	0.5751010109735852
1978	1.8898082118975694
1979	4.03438928866804
1980	5.716362863586948
1981	8.59460069233457
1982	8.17720821228698
1983	6.618035468942819
1984	8.140906601926757
1985	6.563243833655473
1986	6.193869587084842
1987	5.587520283455384
1988	5.590302237069634
1989	6.6902646662395
1990	6.039749853491634
1991	4.915295961203665
1992	3.884294897661429
1993	3.545632163814808
1994	4.898541338048453
1995	6.594217971110523
1996	6.324285987508511
1997	6.603347423592494
1998	7.149945264678481
1999	6.487267351430267
2000	6.813792458514205
2001	4.567138943649962
2002	3.0732472423634976
2003	2.1065944904453655
2004	1.6076804608089537
2005	2.9608752131304388
2006	4.7278636699075784
2007	5.199863763119779
2008	3.1010422197860636
2009	2.6170776546007923
2010	2.01028262116756
2011	1.1628986522835818
2012	1.362463749765713
2013	1.522213388619228
2014	1.4825613905922823
2015	2.310514640598371
2016	2.5372322985710367
2017	2.2652963801397283
2018	2.5547498751073885
2019	3.544497456735186
2020	2.194566423461841
2021	-1.2762333113845887