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| year | production | consumption |
| 1986 | 49.00 | 49.00 |
| 1987 | 50.00 | 50.00 |
| 1988 | 52.00 | 52.00 |
| 1989 | 51.00 | 51.00 |
| 1990 | 51.00 | 49.00 |
| 1991 | 56.00 | 50.00 |
| 1992 | 49.00 | 42.00 |
| 1993 | 41.00 | 35.00 |
| 1994 | 30.00 | 30.00 |
| 1995 | 25.00 | 25.00 |
| 1996 | 28.00 | 33.00 |
| 1997 | 25.00 | 25.00 |
| 1998 | 24.00 | 24.00 |
| 1999 | 22.00 | 22.00 |
| 2000 | 21.00 | 21.00 |
| 2001 | 21.00 | 21.00 |
| 2002 | 21.00 | 21.00 |
| 2003 | 19.00 | 15.00 |
| 2004 | 11.00 | 11.00 |
| 2005 | 6.50 | 6.50 |
| 2006 | 3.50 | 3.50 |
| 2007 | 3.00 | 3.00 |
| 2008 | 2.80 | 2.80 |
| 2009 | 3.20 | 3.20 |
| 2010 | 3.20 | 3.20 |
| 2011 | 2.90 | 2.90 |
| 2012 | 6.30 | 1.70 |
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