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| year | production | consumption |
| 1980 | 67.00 | 66.00 |
| 1981 | 51.00 | 51.00 |
| 1982 | 45.00 | 45.00 |
| 1983 | 38.00 | 38.00 |
| 1984 | 38.00 | 15.00 |
| 1985 | 37.00 | 15.00 |
| 1986 | 39.00 | 13.00 |
| 1987 | 36.00 | 12.00 |
| 1988 | 32.00 | 13.00 |
| 1989 | 42.00 | 13.00 |
| 1990 | 40.00 | 12.00 |
| 1991 | 45.00 | 11.00 |
| 1992 | 44.00 | 11.00 |
| 1993 | 49.00 | 11.00 |
| 1994 | 55.00 | 9.30 |
| 1995 | 52.00 | 9.50 |
| 1996 | 51.00 | 9.00 |
| 1997 | 46.00 | 9.10 |
| 1998 | 36.00 | 7.90 |
| 1999 | 33.00 | 7.90 |
| 2000 | 31.00 | 8.00 |
| 2001 | 32.00 | 6.40 |
| 2002 | 32.00 | 6.60 |
| 2003 | 32.00 | 7.30 |
| 2004 | 32.00 | 7.90 |
| 2005 | 34.00 | 6.70 |
| 2006 | 33.00 | 4.50 |
| 2007 | 32.00 | 5.30 |
| 2008 | 30.00 | 4.90 |
| 2009 | 27.00 | 5.10 |
| 2010 | 13.00 | 5.70 |
| 2011 | 9.90 | 5.60 |
| 2012 | 4.30 | 5.80 |
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