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| year | production | consumption |
| 1980 | 26.00 | 2,256.00 |
| 1981 | 34.00 | 2,023.00 |
| 1982 | 34.00 | 1,880.00 |
| 1983 | 35.00 | 1,835.00 |
| 1984 | 35.00 | 1,771.00 |
| 1985 | 50.00 | 1,753.00 |
| 1986 | 60.00 | 1,764.00 |
| 1987 | 65.00 | 1,785.00 |
| 1988 | 67.00 | 1,801.00 |
| 1989 | 65.00 | 1,844.00 |
| 1990 | 61.00 | 1,827.00 |
| 1991 | 59.00 | 1,942.00 |
| 1992 | 58.00 | 1,933.00 |
| 1993 | 55.00 | 1,879.00 |
| 1994 | 56.00 | 1,866.00 |
| 1995 | 50.00 | 1,915.00 |
| 1996 | 43.00 | 1,943.00 |
| 1997 | 36.00 | 1,962.00 |
| 1998 | 34.00 | 2,040.00 |
| 1999 | 30.00 | 2,034.00 |
| 2000 | 29.00 | 2,001.00 |
| 2001 | 28.00 | 2,054.00 |
| 2002 | 27.00 | 1,991.00 |
| 2003 | 24.00 | 2,001.00 |
| 2004 | 23.00 | 2,008.00 |
| 2005 | 21.00 | 1,990.00 |
| 2006 | 21.00 | 1,991.00 |
| 2007 | 20.00 | 1,978.00 |
| 2008 | 20.00 | 1,940.00 |
| 2009 | 18.00 | 1,863.00 |
| 2010 | 18.00 | 1,822.00 |
| 2011 | 18.00 | 1,779.00 |
| 2012 | 16.00 | 1,739.00 |
| 2013 | 16.00 | 1,713.00 |
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