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| year | production | consumption |
| 1980 | 137.00 | 158.00 |
| 1981 | 119.00 | 127.00 |
| 1982 | 115.00 | 129.00 |
| 1983 | 110.00 | 127.00 |
| 1984 | 114.00 | 115.00 |
| 1985 | 94.00 | 114.00 |
| 1986 | 89.00 | 98.00 |
| 1987 | 79.00 | 95.00 |
| 1988 | 79.00 | 96.00 |
| 1989 | 74.00 | 84.00 |
| 1990 | 45.00 | 43.00 |
| 1991 | 38.00 | 46.00 |
| 1992 | 40.00 | 41.00 |
| 1993 | 48.00 | 50.00 |
| 1994 | 58.00 | 49.00 |
| 1995 | 53.00 | 54.00 |
| 1996 | 62.00 | 62.00 |
| 1997 | 65.00 | 66.00 |
| 1998 | 76.00 | 78.00 |
| 1999 | 67.00 | 73.00 |
| 2000 | 65.00 | 67.00 |
| 2001 | 73.00 | 72.00 |
| 2002 | 57.00 | 43.00 |
| 2003 | 56.00 | 55.00 |
| 2004 | 64.00 | 64.00 |
| 2005 | 66.00 | 70.00 |
| 2006 | 47.00 | 54.00 |
| 2007 | 36.00 | 32.00 |
| 2008 | 16.00 | 14.00 |
| 2009 | 20.00 | 18.00 |
| 2010 | 19.00 | 20.00 |
| 2011 | 16.00 | 12.00 |
| 2012 | 7.60 | 5.30 |
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