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Loading...
| year | production | consumption |
| 1980 | 38.00 | 244.00 |
| 1981 | 38.00 | 236.00 |
| 1982 | 41.00 | 223.00 |
| 1983 | 40.00 | 223.00 |
| 1984 | 40.00 | 200.00 |
| 1985 | 37.00 | 206.00 |
| 1986 | 37.00 | 195.00 |
| 1987 | 35.00 | 199.00 |
| 1988 | 39.00 | 182.00 |
| 1989 | 36.00 | 183.00 |
| 1990 | 40.00 | 178.00 |
| 1991 | 34.00 | 164.00 |
| 1992 | 33.00 | 164.00 |
| 1993 | 34.00 | 161.00 |
| 1994 | 39.00 | 162.00 |
| 1995 | 35.00 | 155.00 |
| 1996 | 32.00 | 145.00 |
| 1997 | 35.00 | 149.00 |
| 1998 | 26.00 | 156.00 |
| 1999 | 24.00 | 149.00 |
| 2000 | 27.00 | 143.00 |
| 2001 | 27.00 | 138.00 |
| 2002 | 24.00 | 140.00 |
| 2003 | 25.00 | 135.00 |
| 2004 | 24.00 | 136.00 |
| 2005 | 19.00 | 155.00 |
| 2006 | 18.00 | 163.00 |
| 2007 | 16.00 | 161.00 |
| 2008 | 16.00 | 159.00 |
| 2009 | 16.00 | 158.00 |
| 2010 | 14.00 | 149.00 |
| 2011 | 13.00 | 143.00 |
| 2012 | 13.00 | 133.00 |
| 2013 | 12.00 | 129.00 |
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