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| year | production | consumption |
| 1986 | 3.90 | 3.90 |
| 1987 | 8.90 | 8.80 |
| 1988 | 2.50 | 8.00 |
| 1989 | 3.20 | 12.00 |
| 1990 | 5.60 | 16.00 |
| 1991 | 5.20 | 18.00 |
| 1992 | 7.80 | 22.00 |
| 1993 | 12.00 | 20.00 |
| 1994 | 8.00 | 14.00 |
| 1995 | 11.00 | 20.00 |
| 1996 | 12.00 | 20.00 |
| 1997 | 13.00 | 75.00 |
| 1998 | 14.00 | 39.00 |
| 1999 | 19.00 | 45.00 |
| 2000 | 25.00 | 40.00 |
| 2001 | 26.00 | 38.00 |
| 2002 | 27.00 | 46.00 |
| 2003 | 28.00 | 43.00 |
| 2004 | 36.00 | 45.00 |
| 2005 | 41.00 | 49.00 |
| 2006 | 80.00 | 57.00 |
| 2007 | 36.00 | 45.00 |
| 2008 | 35.00 | 38.00 |
| 2009 | 22.00 | 64.00 |
| 2010 | 21.00 | 86.00 |
| 2011 | 20.00 | 84.00 |
| 2012 | 21.00 | 85.00 |
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