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Loading...
| year | production | consumption |
| 1980 | 44.00 | 30.00 |
| 1981 | 46.00 | 31.00 |
| 1982 | 46.00 | 34.00 |
| 1983 | 55.00 | 38.00 |
| 1984 | 57.00 | 34.00 |
| 1985 | 56.00 | 35.00 |
| 1986 | 51.00 | 38.00 |
| 1987 | 64.00 | 40.00 |
| 1988 | 61.00 | 42.00 |
| 1989 | 56.00 | 45.00 |
| 1990 | 69.00 | 46.00 |
| 1991 | 74.00 | 46.00 |
| 1992 | 82.00 | 46.00 |
| 1993 | 79.00 | 43.00 |
| 1994 | 95.00 | 44.00 |
| 1995 | 104.00 | 44.00 |
| 1996 | 97.00 | 42.00 |
| 1997 | 87.00 | 44.00 |
| 1998 | 97.00 | 43.00 |
| 1999 | 99.00 | 43.00 |
| 2000 | 91.00 | 41.00 |
| 2001 | 88.00 | 42.00 |
| 2002 | 101.00 | 43.00 |
| 2003 | 99.00 | 43.00 |
| 2004 | 100.00 | 44.00 |
| 2005 | 94.00 | 43.00 |
| 2006 | 100.00 | 43.00 |
| 2007 | 101.00 | 43.00 |
| 2008 | 99.00 | 41.00 |
| 2009 | 98.00 | 40.00 |
| 2010 | 90.00 | 39.00 |
| 2011 | 94.00 | 38.00 |
| 2012 | 96.00 | 36.00 |
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