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| year | production | consumption |
| 1986 | .80 | .80 |
| 1987 | .60 | .50 |
| 1988 | .60 | .50 |
| 1989 | .30 | .30 |
| 1990 | .30 | .50 |
| 1991 | .30 | .40 |
| 1992 | .70 | .50 |
| 1993 | 7.20 | 9.00 |
| 1994 | 7.90 | 9.50 |
| 1995 | 7.40 | 11.00 |
| 1996 | 8.20 | 12.00 |
| 1997 | 7.80 | 11.00 |
| 1998 | 8.40 | 12.00 |
| 1999 | 7.70 | 15.00 |
| 2000 | 7.60 | 13.00 |
| 2001 | 8.80 | 13.00 |
| 2002 | 8.70 | 13.00 |
| 2003 | 9.80 | 15.00 |
| 2004 | 12.00 | 16.00 |
| 2005 | 12.00 | 16.00 |
| 2006 | 13.00 | 18.00 |
| 2007 | 14.00 | 23.00 |
| 2008 | 15.00 | 25.00 |
| 2009 | 11.00 | 22.00 |
| 2010 | 11.00 | 23.00 |
| 2011 | 12.00 | 25.00 |
| 2012 | 13.00 | 28.00 |
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