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| year | production | consumption |
| 1980 | 32.00 | 32.00 |
| 1981 | 49.00 | 49.00 |
| 1982 | 72.00 | 73.00 |
| 1983 | 78.00 | 77.00 |
| 1984 | 82.00 | 82.00 |
| 1985 | 87.00 | 87.00 |
| 1986 | 59.00 | 59.00 |
| 1987 | 59.00 | 59.00 |
| 1988 | 71.00 | 71.00 |
| 1989 | 80.00 | 80.00 |
| 1990 | 82.00 | 82.00 |
| 1991 | 84.00 | 84.00 |
| 1992 | 83.00 | 83.00 |
| 1993 | 94.00 | 94.00 |
| 1994 | 96.00 | 96.00 |
| 1995 | 98.00 | 102.00 |
| 1996 | 95.00 | 114.00 |
| 1997 | 83.00 | 118.00 |
| 1998 | 62.00 | 118.00 |
| 1999 | 48.00 | 125.00 |
| 2000 | 42.00 | 142.00 |
| 2001 | 29.00 | 148.00 |
| 2002 | 30.00 | 151.00 |
| 2003 | 24.00 | 152.00 |
| 2004 | 30.00 | 157.00 |
| 2005 | 20.00 | 145.00 |
| 2006 | 18.00 | 163.00 |
| 2007 | 16.00 | 175.00 |
| 2008 | 15.00 | 183.00 |
| 2009 | 14.00 | 177.00 |
| 2010 | 10.00 | 194.00 |
| 2011 | 7.30 | 171.00 |
| 2012 | 7.90 | 167.00 |
| 2013 | 6.60 | 160.00 |
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