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| year | production | consumption |
| 1986 | 70.00 | 80.00 |
| 1987 | 70.00 | 82.00 |
| 1988 | 69.00 | 82.00 |
| 1989 | 94.00 | 69.00 |
| 1990 | 56.00 | 49.00 |
| 1991 | 27.00 | 31.00 |
| 1992 | 29.00 | 32.00 |
| 1993 | 32.00 | 29.00 |
| 1994 | 43.00 | 27.00 |
| 1995 | 52.00 | 30.00 |
| 1996 | 48.00 | 32.00 |
| 1997 | 42.00 | 26.00 |
| 1998 | 40.00 | 25.00 |
| 1999 | 42.00 | 27.00 |
| 2000 | 39.00 | 19.00 |
| 2001 | 30.00 | 18.00 |
| 2002 | 40.00 | 32.00 |
| 2003 | 38.00 | 30.00 |
| 2004 | 39.00 | 36.00 |
| 2005 | 46.00 | 40.00 |
| 2006 | 52.00 | 41.00 |
| 2007 | 53.00 | 40.00 |
| 2008 | 49.00 | 38.00 |
| 2009 | 43.00 | 39.00 |
| 2010 | 40.00 | 37.00 |
| 2011 | 41.00 | 42.00 |
| 2012 | 45.00 | 38.00 |
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