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| year | production | consumption |
| 1986 | 49.00 | 33.00 |
| 1987 | 68.00 | 41.00 |
| 1988 | 74.00 | 47.00 |
| 1989 | 70.00 | 45.00 |
| 1990 | 83.00 | 47.00 |
| 1991 | 84.00 | 47.00 |
| 1992 | 84.00 | 37.00 |
| 1993 | 82.00 | 39.00 |
| 1994 | 84.00 | 38.00 |
| 1995 | 86.00 | 48.00 |
| 1996 | 87.00 | 53.00 |
| 1997 | 87.00 | 52.00 |
| 1998 | 87.00 | 43.00 |
| 1999 | 89.00 | 46.00 |
| 2000 | 95.00 | 46.00 |
| 2001 | 97.00 | 43.00 |
| 2002 | 95.00 | 60.00 |
| 2003 | 97.00 | 93.00 |
| 2004 | 98.00 | 92.00 |
| 2005 | 99.00 | 93.00 |
| 2006 | 92.00 | 85.00 |
| 2007 | 93.00 | 86.00 |
| 2008 | 110.00 | 107.00 |
| 2009 | 159.00 | 121.00 |
| 2010 | 120.00 | 128.00 |
| 2011 | 37.00 | 55.00 |
| 2012 | 46.00 | 80.00 |
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