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| year | production | consumption |
| 1986 | 5.30 | 2.20 |
| 1987 | 6.00 | 4.80 |
| 1988 | 6.50 | 4.90 |
| 1989 | 5.00 | 6.50 |
| 1990 | 5.50 | 4.80 |
| 1991 | 5.80 | 4.80 |
| 1992 | 6.10 | 5.00 |
| 1993 | 6.80 | 5.50 |
| 1994 | 7.70 | 5.20 |
| 1995 | 18.00 | 9.00 |
| 1996 | 8.30 | 10.00 |
| 1997 | 8.80 | 12.00 |
| 1998 | 8.80 | 13.00 |
| 1999 | 8.00 | .40 |
| 2000 | 9.00 | 16.00 |
| 2001 | 8.90 | 17.00 |
| 2002 | 8.80 | 17.00 |
| 2003 | 10.00 | 18.00 |
| 2004 | 10.00 | 1.70 |
| 2005 | 11.00 | 1.80 |
| 2006 | 29.00 | 18.00 |
| 2007 | 11.00 | 18.00 |
| 2008 | 9.20 | 18.00 |
| 2009 | 11.00 | 1.80 |
| 2010 | 11.00 | 23.00 |
| 2011 | 3.40 | 13.00 |
| 2012 | 3.20 | 9.50 |
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