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year | production | consumption |
1980 | .05 | .05 |
1981 | .13 | .13 |
1982 | .17 | .17 |
1983 | .18 | .18 |
1984 | .18 | .18 |
1985 | .18 | .18 |
1986 | .21 | .21 |
1987 | .23 | .23 |
1988 | .25 | .25 |
1989 | .26 | .26 |
1990 | .29 | .29 |
1991 | .27 | .27 |
1992 | .22 | .22 |
1993 | .24 | .24 |
1994 | .25 | .25 |
1995 | .28 | .28 |
1996 | .33 | .33 |
1997 | .36 | .36 |
1998 | .62 | .62 |
1999 | 1.08 | 1.08 |
2000 | 1.26 | 1.26 |
2001 | 1.38 | 1.38 |
2002 | 1.36 | 1.36 |
2003 | 1.34 | 1.34 |
2004 | 1.41 | 1.41 |
2005 | 1.58 | 1.58 |
2006 | 2.50 | 2.50 |
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