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| year | production | consumption |
| 1986 | 25.00 | 22.00 |
| 1987 | 27.00 | 21.00 |
| 1988 | 27.00 | 21.00 |
| 1989 | 28.00 | 22.00 |
| 1990 | 29.00 | 23.00 |
| 1991 | 30.00 | 30.00 |
| 1992 | 31.00 | 33.00 |
| 1993 | 28.00 | 26.00 |
| 1994 | 33.00 | 25.00 |
| 1995 | 35.00 | 27.00 |
| 1996 | 34.00 | 27.00 |
| 1997 | 35.00 | 27.00 |
| 1998 | 36.00 | 39.00 |
| 1999 | 35.00 | 35.00 |
| 2000 | 53.00 | 51.00 |
| 2001 | 45.00 | 50.00 |
| 2002 | 50.00 | 50.00 |
| 2003 | 30.00 | 50.00 |
| 2004 | 41.00 | 72.00 |
| 2005 | 44.00 | 75.00 |
| 2006 | 57.00 | 73.00 |
| 2007 | 55.00 | 84.00 |
| 2008 | 51.00 | 87.00 |
| 2009 | 56.00 | 91.00 |
| 2010 | 53.00 | 90.00 |
| 2011 | 59.00 | 101.00 |
| 2012 | 66.00 | 112.00 |
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