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| year | production | consumption |
| 1980 | 194.00 | 131.00 |
| 1981 | 128.00 | 94.00 |
| 1982 | 62.00 | 45.00 |
| 1983 | 58.00 | 36.00 |
| 1984 | 84.00 | 58.00 |
| 1985 | 154.00 | 95.00 |
| 1986 | 159.00 | 83.00 |
| 1987 | 160.00 | 88.00 |
| 1988 | 90.00 | 34.00 |
| 1989 | 93.00 | 36.00 |
| 1990 | 99.00 | 47.00 |
| 1991 | 110.00 | 72.00 |
| 1992 | 96.00 | 57.00 |
| 1993 | 31.00 | 8.80 |
| 1994 | 28.00 | 28.00 |
| 1995 | 22.00 | 22.00 |
| 1996 | 8.80 | 8.80 |
| 1997 | 11.00 | 11.00 |
| 1998 | 13.00 | 13.00 |
| 1999 | 18.00 | 18.00 |
| 2000 | 3.30 | 3.30 |
| 2001 | 3.30 | 3.30 |
| 2002 | 47.00 | 47.00 |
| 2003 | 25.00 | 25.00 |
| 2004 | 8.80 | 8.80 |
| 2005 | 8.80 | 8.80 |
| 2006 | 8.80 | 8.80 |
| 2007 | 25.00 | 25.00 |
| 2008 | 35.00 | 35.00 |
| 2009 | 37.00 | 37.00 |
| 2010 | 42.00 | 42.00 |
| 2011 | 35.00 | 35.00 |
| 2012 | 53.00 | 53.00 |
| 2013 | 53.00 | 53.00 |
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