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| year | production | consumption |
| 1986 | 44.00 | 47.00 |
| 1987 | 52.00 | 49.00 |
| 1988 | 51.00 | 51.00 |
| 1989 | 55.00 | 50.00 |
| 1990 | 51.00 | 51.00 |
| 1991 | 48.00 | 50.00 |
| 1992 | 46.00 | 46.00 |
| 1993 | 95.00 | 44.00 |
| 1994 | 102.00 | 44.00 |
| 1995 | 105.00 | 45.00 |
| 1996 | 111.00 | 50.00 |
| 1997 | 118.00 | 49.00 |
| 1998 | 123.00 | 50.00 |
| 1999 | 120.00 | 53.00 |
| 2000 | 53.00 | 54.00 |
| 2001 | 54.00 | 56.00 |
| 2002 | 56.00 | 51.00 |
| 2003 | 73.00 | 58.00 |
| 2004 | 63.00 | 63.00 |
| 2005 | 86.00 | 69.00 |
| 2006 | 86.00 | 77.00 |
| 2007 | 88.00 | 80.00 |
| 2008 | 99.00 | 102.00 |
| 2009 | 102.00 | 114.00 |
| 2010 | 96.00 | 120.00 |
| 2011 | 97.00 | 132.00 |
| 2012 | 78.00 | 126.00 |
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