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| year | production | consumption |
| 1980 | 85.00 | 85.00 |
| 1981 | 85.00 | 85.00 |
| 1982 | 49.00 | 49.00 |
| 1983 | 46.00 | 46.00 |
| 1984 | 48.00 | 48.00 |
| 1985 | 44.00 | 44.00 |
| 1986 | 26.00 | 26.00 |
| 1987 | 26.00 | 26.00 |
| 1988 | 35.00 | 35.00 |
| 1989 | 57.00 | 57.00 |
| 1990 | 66.00 | 66.00 |
| 1991 | 52.00 | 52.00 |
| 1992 | 55.00 | 54.00 |
| 1993 | 62.00 | 62.00 |
| 1994 | 69.00 | 69.00 |
| 1995 | 67.00 | 67.00 |
| 1996 | 64.00 | 64.00 |
| 1997 | 75.00 | 99.00 |
| 1998 | 70.00 | 114.00 |
| 1999 | 42.00 | 162.00 |
| 2000 | 40.00 | 184.00 |
| 2001 | 42.00 | 224.00 |
| 2002 | 39.00 | 227.00 |
| 2003 | 65.00 | 279.00 |
| 2004 | 38.00 | 293.00 |
| 2005 | 68.00 | 295.00 |
| 2006 | 65.00 | 263.00 |
| 2007 | 63.00 | 157.00 |
| 2008 | 61.00 | 97.00 |
| 2009 | 68.00 | 115.00 |
| 2010 | 66.00 | 187.00 |
| 2011 | 56.00 | 201.00 |
| 2012 | 44.00 | 172.00 |
| 2013 | 34.00 | 173.00 |
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