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| year | production | consumption |
| 1980 | 65.00 | 59.00 |
| 1981 | 63.00 | 58.00 |
| 1982 | 54.00 | 51.00 |
| 1983 | 54.00 | 55.00 |
| 1984 | 42.00 | 50.00 |
| 1985 | 37.00 | 49.00 |
| 1986 | 34.00 | 44.00 |
| 1987 | 29.00 | 45.00 |
| 1988 | 34.00 | 35.00 |
| 1989 | 35.00 | 32.00 |
| 1990 | 30.00 | 30.00 |
| 1991 | 32.00 | 37.00 |
| 1992 | 34.00 | 42.00 |
| 1993 | 38.00 | 46.00 |
| 1994 | 31.00 | 46.00 |
| 1995 | 29.00 | 44.00 |
| 1996 | 26.00 | 40.00 |
| 1997 | 25.00 | 40.00 |
| 1998 | 23.00 | 40.00 |
| 1999 | 24.00 | 36.00 |
| 2000 | 24.00 | 27.00 |
| 2001 | 23.00 | 23.00 |
| 2002 | 7.40 | 13.00 |
| 2003 | 6.50 | 12.00 |
| 2004 | 5.60 | 8.20 |
| 2005 | 3.90 | 4.30 |
| 2006 | 4.20 | 4.10 |
| 2007 | 3.50 | 3.90 |
| 2008 | 3.60 | 3.30 |
| 2009 | 2.90 | 4.00 |
| 2010 | 2.00 | 2.40 |
| 2011 | 2.40 | 1.90 |
| 2012 | 1.60 | 1.50 |
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