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| year | production | consumption |
| 1980 | 148.00 | 210.00 |
| 1981 | 108.00 | 169.00 |
| 1982 | 96.00 | 127.00 |
| 1983 | 106.00 | 103.00 |
| 1984 | 78.00 | 87.00 |
| 1985 | 72.00 | 95.00 |
| 1986 | 74.00 | 93.00 |
| 1987 | 76.00 | 86.00 |
| 1988 | 69.00 | 65.00 |
| 1989 | 86.00 | 56.00 |
| 1990 | 90.00 | 50.00 |
| 1991 | 94.00 | 52.00 |
| 1992 | 100.00 | 53.00 |
| 1993 | 106.00 | 58.00 |
| 1994 | 101.00 | 68.00 |
| 1995 | 97.00 | 65.00 |
| 1996 | 103.00 | 81.00 |
| 1997 | 110.00 | 68.00 |
| 1998 | 105.00 | 74.00 |
| 1999 | 100.00 | 67.00 |
| 2000 | 112.00 | 55.00 |
| 2001 | 105.00 | 57.00 |
| 2002 | 89.00 | 56.00 |
| 2003 | 91.00 | 63.00 |
| 2004 | 95.00 | 62.00 |
| 2005 | 98.00 | 58.00 |
| 2006 | 92.00 | 61.00 |
| 2007 | 74.00 | 55.00 |
| 2008 | 82.00 | 52.00 |
| 2009 | 78.00 | 55.00 |
| 2010 | 91.00 | 55.00 |
| 2011 | 88.00 | 43.00 |
| 2012 | 90.00 | 40.00 |
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