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| year | production | consumption |
| 1980 | 13.00 | 13.00 |
| 1981 | 14.00 | 14.00 |
| 1982 | 18.00 | 18.00 |
| 1983 | 16.00 | 20.00 |
| 1984 | 20.00 | 35.00 |
| 1985 | 14.00 | 42.00 |
| 1986 | 15.00 | 39.00 |
| 1987 | 13.00 | 45.00 |
| 1988 | 12.00 | 39.00 |
| 1989 | 13.00 | 55.00 |
| 1990 | 12.00 | 54.00 |
| 1991 | 8.00 | 41.00 |
| 1992 | 14.00 | 31.00 |
| 1993 | 13.00 | 53.00 |
| 1994 | 12.00 | 69.00 |
| 1995 | 12.00 | 58.00 |
| 1996 | 28.00 | 67.00 |
| 1997 | 59.00 | 91.00 |
| 1998 | 67.00 | 104.00 |
| 1999 | 67.00 | 106.00 |
| 2000 | 66.00 | 109.00 |
| 2001 | 79.00 | 135.00 |
| 2002 | 76.00 | 136.00 |
| 2003 | 81.00 | 130.00 |
| 2004 | 85.00 | 131.00 |
| 2005 | 88.00 | 152.00 |
| 2006 | 88.00 | 134.00 |
| 2007 | 56.00 | 100.00 |
| 2008 | 48.00 | 98.00 |
| 2009 | 64.00 | 108.00 |
| 2010 | 72.00 | 116.00 |
| 2011 | 68.00 | 117.00 |
| 2012 | 66.00 | 133.00 |
| 2013 | 66.00 | 144.00 |
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