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| year | production | consumption |
| 1986 | 38.00 | 55.00 |
| 1987 | 39.00 | 51.00 |
| 1988 | 42.00 | 57.00 |
| 1989 | 32.00 | 51.00 |
| 1990 | 63.00 | 71.00 |
| 1991 | 58.00 | 65.00 |
| 1992 | 54.00 | 61.00 |
| 1993 | 58.00 | 74.00 |
| 1994 | 43.00 | 64.00 |
| 1995 | 46.00 | 73.00 |
| 1996 | 55.00 | 74.00 |
| 1997 | 57.00 | 84.00 |
| 1998 | 64.00 | 89.00 |
| 1999 | 53.00 | 75.00 |
| 2000 | 52.00 | 49.00 |
| 2001 | 48.00 | 47.00 |
| 2002 | 49.00 | 62.00 |
| 2003 | 39.00 | 36.00 |
| 2004 | 40.00 | 36.00 |
| 2005 | 40.00 | 37.00 |
| 2006 | 43.00 | 47.00 |
| 2007 | 37.00 | 42.00 |
| 2008 | 37.00 | 46.00 |
| 2009 | 28.00 | 30.00 |
| 2010 | 12.00 | 16.00 |
| 2011 | 17.00 | 34.00 |
| 2012 | 37.00 | 33.00 |
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