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Loading...
| year | production | consumption |
| 1980 | 27.00 | 34.00 |
| 1981 | 26.00 | 32.00 |
| 1982 | 27.00 | 35.00 |
| 1983 | 27.00 | 36.00 |
| 1984 | 29.00 | 35.00 |
| 1985 | 30.00 | 37.00 |
| 1986 | 28.00 | 39.00 |
| 1987 | 33.00 | 41.00 |
| 1988 | 31.00 | 41.00 |
| 1989 | 38.00 | 41.00 |
| 1990 | 73.00 | 41.00 |
| 1991 | 61.00 | 40.00 |
| 1992 | 75.00 | 39.00 |
| 1993 | 75.00 | 39.00 |
| 1994 | 73.00 | 39.00 |
| 1995 | 64.00 | 39.00 |
| 1996 | 71.00 | 39.00 |
| 1997 | 79.00 | 39.00 |
| 1998 | 74.00 | 39.00 |
| 1999 | 74.00 | 39.00 |
| 2000 | 78.00 | 37.00 |
| 2001 | 76.00 | 39.00 |
| 2002 | 68.00 | 39.00 |
| 2003 | 82.00 | 38.00 |
| 2004 | 75.00 | 38.00 |
| 2005 | 89.00 | 37.00 |
| 2006 | 96.00 | 35.00 |
| 2007 | 91.00 | 33.00 |
| 2008 | 69.00 | 31.00 |
| 2009 | 83.00 | 29.00 |
| 2010 | 77.00 | 28.00 |
| 2011 | 88.00 | 25.00 |
| 2012 | 85.00 | 23.00 |
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