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Loading...
| year | production | consumption |
| 1986 | 4.90 | 4.90 |
| 1987 | 6.00 | 5.30 |
| 1988 | 5.80 | 5.40 |
| 1989 | 6.30 | 5.70 |
| 1990 | 7.20 | 6.80 |
| 1991 | 7.90 | 7.80 |
| 1992 | 7.20 | 7.80 |
| 1993 | .10 | .10 |
| 1994 | .80 | 2.20 |
| 1995 | .80 | .50 |
| 1996 | .50 | .50 |
| 1997 | .50 | .50 |
| 1998 | .50 | .50 |
| 1999 | .60 | .60 |
| 2000 | .50 | .50 |
| 2001 | .50 | .50 |
| 2002 | .50 | .50 |
| 2003 | .50 | .50 |
| 2004 | .60 | .60 |
| 2005 | .60 | .60 |
| 2006 | .60 | .60 |
| 2007 | .00 | .00 |
| 2008 | .00 | .00 |
| 2009 | 6.70 | .60 |
| 2010 | 7.70 | .90 |
| 2011 | 8.20 | 1.00 |
| 2012 | 6.70 | .60 |
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