Year	2007 US$
1980	31.84
1981	37.7
1982	33.51
1983	35.08
1984	70.24
1985	79.57
1986	79.84
1987	84.54
1988	102.8
1989	103.6
1990	120.2
1991	192.7
1992	154.1
1993	206.1
1994	225.5
1995	213.9
1996	267.8
1997	360.8
1998	421.3
1999	445.7
2000	515.5
2001	593
2002	586.6
2003	596.9
2004	641.8
2005	670.9
2006	701.2
2007	816.4