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Loading...
| year | production | consumption |
| 1980 | .23 | .23 |
| 1981 | .34 | .34 |
| 1982 | .39 | .39 |
| 1983 | .30 | .30 |
| 1984 | .49 | .49 |
| 1985 | .25 | .25 |
| 1986 | .41 | .41 |
| 1987 | .29 | .29 |
| 1988 | .51 | .51 |
| 1989 | .52 | .52 |
| 1990 | .23 | .23 |
| 1991 | .21 | .21 |
| 1992 | .28 | .28 |
| 1993 | .27 | .27 |
| 1994 | .30 | .30 |
| 1995 | .39 | .39 |
| 1996 | .50 | .50 |
| 1997 | .50 | .50 |
| 1998 | .56 | .56 |
| 1999 | .49 | .49 |
| 2000 | .52 | .52 |
| 2001 | .52 | .52 |
| 2002 | .52 | .52 |
| 2003 | .52 | .52 |
| 2004 | .54 | .54 |
| 2005 | .57 | .57 |
| 2006 | .62 | .62 |
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