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Loading...
| year | production | consumption |
| 1980 | 175.00 | 11.00 |
| 1981 | 151.00 | 12.00 |
| 1982 | 156.00 | 11.00 |
| 1983 | 157.00 | 14.00 |
| 1984 | 157.00 | 12.00 |
| 1985 | 172.00 | 11.00 |
| 1986 | 166.00 | 9.80 |
| 1987 | 155.00 | 10.00 |
| 1988 | 159.00 | 12.00 |
| 1989 | 208.00 | 16.00 |
| 1990 | 270.00 | 15.00 |
| 1991 | 294.00 | 16.00 |
| 1992 | 298.00 | 16.00 |
| 1993 | 313.00 | 15.00 |
| 1994 | 329.00 | 15.00 |
| 1995 | 365.00 | 14.00 |
| 1996 | 368.00 | 15.00 |
| 1997 | 370.00 | 16.00 |
| 1998 | 352.00 | 15.00 |
| 1999 | 331.00 | 13.00 |
| 2000 | 315.00 | 12.00 |
| 2001 | 270.00 | 13.00 |
| 2002 | 251.00 | 12.00 |
| 2003 | 241.00 | 13.00 |
| 2004 | 239.00 | 13.00 |
| 2005 | 266.00 | 13.00 |
| 2006 | 237.00 | 14.00 |
| 2007 | 244.00 | 16.00 |
| 2008 | 248.00 | 18.00 |
| 2009 | 242.00 | 19.00 |
| 2010 | 246.00 | 18.00 |
| 2011 | 245.00 | 18.00 |
| 2012 | 242.00 | 18.00 |
| 2013 | 239.00 | 18.00 |
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