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| year | production | consumption |
| 1986 | 5.10 | 27.00 |
| 1987 | .80 | 34.00 |
| 1988 | 9.90 | 37.00 |
| 1989 | 9.80 | 37.00 |
| 1990 | 8.90 | 38.00 |
| 1991 | 8.40 | 48.00 |
| 1992 | 9.40 | 45.00 |
| 1993 | 8.60 | 64.00 |
| 1994 | 11.00 | 64.00 |
| 1995 | 8.70 | 66.00 |
| 1996 | 13.00 | 65.00 |
| 1997 | 15.00 | 62.00 |
| 1998 | 26.00 | 67.00 |
| 1999 | 102.00 | 72.00 |
| 2000 | 26.00 | 68.00 |
| 2001 | 29.00 | 76.00 |
| 2002 | 28.00 | 72.00 |
| 2003 | 25.00 | 59.00 |
| 2004 | 19.00 | 83.00 |
| 2005 | 22.00 | 56.00 |
| 2006 | 21.00 | 61.00 |
| 2007 | 15.00 | 97.00 |
| 2008 | 15.00 | 100.00 |
| 2009 | 15.00 | 79.00 |
| 2010 | 16.00 | 95.00 |
| 2011 | 9.50 | 101.00 |
| 2012 | 9.10 | 114.00 |
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