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Loading...
| year | production | consumption |
| 1980 | 24.00 | 25.00 |
| 1981 | 21.00 | 22.00 |
| 1982 | 14.00 | 23.00 |
| 1983 | 20.00 | 27.00 |
| 1984 | 23.00 | 29.00 |
| 1985 | 24.00 | 30.00 |
| 1986 | 27.00 | 32.00 |
| 1987 | 28.00 | 33.00 |
| 1988 | 33.00 | 38.00 |
| 1989 | 38.00 | 43.00 |
| 1990 | 41.00 | 46.00 |
| 1991 | 42.00 | 47.00 |
| 1992 | 41.00 | 48.00 |
| 1993 | 46.00 | 55.00 |
| 1994 | 50.00 | 60.00 |
| 1995 | 55.00 | 66.00 |
| 1996 | 58.00 | 72.00 |
| 1997 | 60.00 | 82.00 |
| 1998 | 70.00 | 80.00 |
| 1999 | 71.00 | 88.00 |
| 2000 | 76.00 | 82.00 |
| 2001 | 78.00 | 84.00 |
| 2002 | 78.00 | 87.00 |
| 2003 | 79.00 | 87.00 |
| 2004 | 76.00 | 93.00 |
| 2005 | 73.00 | 102.00 |
| 2006 | 70.00 | 106.00 |
| 2007 | 66.00 | 162.00 |
| 2008 | 75.00 | 169.00 |
| 2009 | 71.00 | 156.00 |
| 2010 | 60.00 | 142.00 |
| 2011 | 65.00 | 154.00 |
| 2012 | 58.00 | 153.00 |
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