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Loading...
| year | production | consumption |
| 1980 | 24.00 | 24.00 |
| 1981 | 22.00 | 22.00 |
| 1982 | 23.00 | 23.00 |
| 1983 | 25.00 | 22.00 |
| 1984 | 25.00 | 22.00 |
| 1985 | 29.00 | 22.00 |
| 1986 | 26.00 | 22.00 |
| 1987 | 20.00 | 22.00 |
| 1988 | 30.00 | 27.00 |
| 1989 | 35.00 | 39.00 |
| 1990 | 37.00 | 68.00 |
| 1991 | 37.00 | 70.00 |
| 1992 | 80.00 | 94.00 |
| 1993 | 87.00 | 119.00 |
| 1994 | 89.00 | 131.00 |
| 1995 | 115.00 | 172.00 |
| 1996 | 140.00 | 201.00 |
| 1997 | 197.00 | 198.00 |
| 1998 | 171.00 | 146.00 |
| 1999 | 248.00 | 211.00 |
| 2000 | 241.00 | 191.00 |
| 2001 | 207.00 | 172.00 |
| 2002 | 173.00 | 165.00 |
| 2003 | 178.00 | 150.00 |
| 2004 | 140.00 | 122.00 |
| 2005 | 123.00 | 112.00 |
| 2006 | 114.00 | 90.00 |
| 2007 | 81.00 | 76.00 |
| 2008 | 87.00 | 78.00 |
| 2009 | 98.00 | 80.00 |
| 2010 | 109.00 | 83.00 |
| 2011 | 97.00 | 73.00 |
| 2012 | 76.00 | 63.00 |
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