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Loading...
| year | production | consumption |
| 1980 | .00 | 412.00 |
| 1981 | .00 | 353.00 |
| 1982 | .00 | 315.00 |
| 1983 | .00 | 184.00 |
| 1984 | .00 | 214.00 |
| 1985 | .00 | 219.00 |
| 1986 | .00 | 202.00 |
| 1987 | .00 | 230.00 |
| 1988 | .00 | 182.00 |
| 1989 | .00 | 217.00 |
| 1990 | .00 | 217.00 |
| 1991 | .00 | 224.00 |
| 1992 | .00 | 306.00 |
| 1993 | .00 | 305.00 |
| 1994 | .00 | 346.00 |
| 1995 | .00 | 239.00 |
| 1996 | .00 | 267.00 |
| 1997 | .00 | 214.00 |
| 1998 | .00 | 168.00 |
| 1999 | .00 | 169.00 |
| 2000 | .00 | 190.00 |
| 2001 | .00 | 211.00 |
| 2002 | .00 | 126.00 |
| 2003 | .00 | 95.00 |
| 2004 | .00 | 139.00 |
| 2005 | .00 | 134.00 |
| 2006 | .00 | 162.00 |
| 2007 | .00 | 133.00 |
| 2008 | .00 | 127.00 |
| 2009 | .00 | 115.00 |
| 2010 | .00 | 112.00 |
| 2011 | .00 | 98.00 |
| 2012 | .00 | 90.00 |
| 2013 | .00 | 83.00 |
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