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Loading...
| year | production | consumption |
| 1980 | 25.00 | 65.00 |
| 1981 | 26.00 | 69.00 |
| 1982 | 25.00 | 68.00 |
| 1983 | 26.00 | 70.00 |
| 1984 | 23.00 | 71.00 |
| 1985 | 23.00 | 71.00 |
| 1986 | 24.00 | 75.00 |
| 1987 | 24.00 | 77.00 |
| 1988 | 23.00 | 80.00 |
| 1989 | 17.00 | 82.00 |
| 1990 | 18.00 | 86.00 |
| 1991 | 27.00 | 89.00 |
| 1992 | 23.00 | 92.00 |
| 1993 | 25.00 | 86.00 |
| 1994 | 25.00 | 86.00 |
| 1995 | 24.00 | 83.00 |
| 1996 | 26.00 | 85.00 |
| 1997 | 27.00 | 89.00 |
| 1998 | 28.00 | 89.00 |
| 1999 | 29.00 | 92.00 |
| 2000 | 25.00 | 92.00 |
| 2001 | 27.00 | 90.00 |
| 2002 | 27.00 | 88.00 |
| 2003 | 25.00 | 87.00 |
| 2004 | 31.00 | 86.00 |
| 2005 | 29.00 | 83.00 |
| 2006 | 34.00 | 81.00 |
| 2007 | 30.00 | 80.00 |
| 2008 | 32.00 | 78.00 |
| 2009 | 33.00 | 76.00 |
| 2010 | 31.00 | 73.00 |
| 2011 | 29.00 | 70.00 |
| 2012 | 24.00 | 68.00 |
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