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Loading...
| year | production | consumption |
| 1986 | 6.00 | .40 |
| 1987 | 4.30 | .80 |
| 1988 | 3.90 | .50 |
| 1989 | 4.30 | .80 |
| 1990 | 5.30 | .90 |
| 1991 | 5.90 | .80 |
| 1992 | 5.00 | .90 |
| 1993 | 5.00 | .50 |
| 1994 | 5.40 | .50 |
| 1995 | 4.80 | .60 |
| 1996 | 4.90 | .60 |
| 1997 | 5.70 | .40 |
| 1998 | .00 | .60 |
| 1999 | .00 | .50 |
| 2000 | 3.80 | .40 |
| 2001 | 4.60 | .70 |
| 2002 | 4.30 | .40 |
| 2003 | 5.40 | .40 |
| 2004 | 5.50 | .30 |
| 2005 | 5.50 | .40 |
| 2006 | 7.00 | .40 |
| 2007 | 8.00 | .20 |
| 2008 | 6.00 | .40 |
| 2009 | 6.50 | .50 |
| 2010 | 4.30 | .30 |
| 2011 | 4.30 | .30 |
| 2012 | 5.40 | .50 |
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