Year	current US$
1980	7362.682435719569
1981	6660.154678422366
1982	6457.395980393132
1983	6527.801278711978
1984	6588.146842069933
1985	6942.281403433931
1986	10391.198784422568
1987	12322.531254532501
1988	12235.842004704917
1989	11973.331042627135
1990	14239.388691996268
1991	14334.55997523751
1992	19424.647074968696
1993	18321.49546386185
1994	18679.83774387984
1995	20941.701254183867
1996	20560.711821700206
1997	17941.876934123982
1998	18055.181389521127
1999	17626.62932858217
2000	15754.669406827961