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| year | production | consumption |
| 1980 | .80 | .80 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | 5.20 | 15.00 |
| 1985 | 5.80 | 13.00 |
| 1986 | 7.50 | 16.00 |
| 1987 | 6.70 | 21.00 |
| 1988 | 5.40 | 19.00 |
| 1989 | 5.10 | 21.00 |
| 1990 | 7.00 | 24.00 |
| 1991 | 8.10 | 25.00 |
| 1992 | 9.30 | 31.00 |
| 1993 | 9.50 | 28.00 |
| 1994 | 8.70 | 31.00 |
| 1995 | 7.30 | 27.00 |
| 1996 | 8.30 | 27.00 |
| 1997 | 8.60 | 28.00 |
| 1998 | 9.30 | 31.00 |
| 1999 | 8.50 | 23.00 |
| 2000 | 9.90 | 25.00 |
| 2001 | 8.90 | 37.00 |
| 2002 | 8.70 | 46.00 |
| 2003 | 11.00 | 36.00 |
| 2004 | 13.00 | 37.00 |
| 2005 | 14.00 | 44.00 |
| 2006 | 9.60 | 46.00 |
| 2007 | 8.40 | 48.00 |
| 2008 | 11.00 | 44.00 |
| 2009 | 8.90 | 31.00 |
| 2010 | 11.00 | 41.00 |
| 2011 | 8.60 | 45.00 |
| 2012 | 12.00 | 40.00 |
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