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Loading...
| year | production | consumption |
| 1980 | .10 | .10 |
| 1981 | .11 | .11 |
| 1982 | .13 | .13 |
| 1983 | .20 | .20 |
| 1984 | .19 | .19 |
| 1985 | .19 | .19 |
| 1986 | .27 | .27 |
| 1987 | .26 | .26 |
| 1988 | .31 | .31 |
| 1989 | .31 | .31 |
| 1990 | .26 | .26 |
| 1991 | .28 | .28 |
| 1992 | .47 | .47 |
| 1993 | .50 | .50 |
| 1994 | .55 | .55 |
| 1995 | .66 | .66 |
| 1996 | .88 | .88 |
| 1997 | .79 | .79 |
| 1998 | .80 | .80 |
| 1999 | .52 | .52 |
| 2000 | .67 | .67 |
| 2001 | 1.52 | 1.52 |
| 2002 | 1.53 | 1.53 |
| 2003 | 1.68 | 1.68 |
| 2004 | 1.67 | 1.67 |
| 2005 | .86 | .86 |
| 2006 | 1.07 | 1.07 |
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