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| year | production | consumption |
| 1986 | 4.90 | 5.30 |
| 1987 | 6.10 | 5.10 |
| 1988 | 5.00 | 5.40 |
| 1989 | 4.70 | 3.00 |
| 1990 | 4.90 | 3.20 |
| 1991 | 5.50 | 7.30 |
| 1992 | 5.70 | 7.80 |
| 1993 | 5.80 | 5.10 |
| 1994 | 5.80 | 5.80 |
| 1995 | 5.80 | 5.80 |
| 1996 | 6.70 | 6.70 |
| 1997 | 1.70 | 5.40 |
| 1998 | 1.40 | 5.00 |
| 1999 | 1.10 | 6.40 |
| 2000 | 1.50 | 5.70 |
| 2001 | 1.50 | 7.00 |
| 2002 | 1.20 | 7.10 |
| 2003 | 1.20 | 7.40 |
| 2004 | 1.30 | 7.80 |
| 2005 | 1.50 | 8.10 |
| 2006 | 1.40 | 8.80 |
| 2007 | .90 | 8.80 |
| 2008 | .80 | 9.00 |
| 2009 | 1.00 | 9.70 |
| 2010 | 6.50 | 6.50 |
| 2011 | 7.10 | 11.00 |
| 2012 | 5.30 | 18.00 |
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