Year	current US$
1966	6.7087642617502325
1967	2.466163292511875
1968	3.5430692309116445
1969	5.403293317024864
1970	9.61072396609237
1971	18.857025672215308
1972	19.305177111720052
1973	18.966411736635017
1974	14.602340092858316
1975	17.48350872824226
1976	23.313026553710678
1977	18.74526793453023
1978	35.3772180058919
1979	25.36320945797011
1980	28.03904223016622
1981	41.42388289305532
1982	33.48432737819568
1983	63.5855030737896
1984	22.154936117075785
1985	23.457705141443597
1986	17.455587834817667
1987	18.364301344653477
1988	7.072135950855767
1989	3.8259539167207444
1990	8.807577496599695
1991	8.943647054543913
1992	4.919065882395008
1993	19.080825376246633
1994	11.080883166868274
1995	1.9443162695937788
1996	21.80423382309837
1997	22.18642734928384
1998	65.16412523488594
1999	-2.2334102046937803
2000	6.801255785096483
2001	1.205831676623984
2002	17.826649903360792
2003	79.51431765264057
2004	112.84705773471816
2005	-2.337861840645502
2006	-3.291115783285144
2007	68.89082375347954
2008	34.038181939117095
2009	42.91594683535982
2010	56.71414658934699