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| year | production | consumption |
| 1986 | 5.00 | 5.10 |
| 1987 | 5.30 | 5.10 |
| 1988 | 5.60 | 5.60 |
| 1989 | 5.90 | 5.80 |
| 1990 | 6.10 | 6.20 |
| 1991 | 4.00 | 4.30 |
| 1992 | 6.70 | 6.70 |
| 1993 | 6.80 | 6.80 |
| 1994 | 7.50 | 7.50 |
| 1995 | 7.10 | 7.70 |
| 1996 | 7.60 | 7.60 |
| 1997 | 7.90 | 8.40 |
| 1998 | 8.10 | 8.10 |
| 1999 | 6.80 | 7.00 |
| 2000 | 8.90 | 9.10 |
| 2001 | 9.30 | 9.60 |
| 2002 | 5.50 | 9.90 |
| 2003 | 6.10 | 11.00 |
| 2004 | 5.20 | 9.60 |
| 2005 | 5.60 | 10.00 |
| 2006 | 4.20 | 9.50 |
| 2007 | 3.30 | 9.80 |
| 2008 | 3.00 | 9.90 |
| 2009 | 2.90 | 10.00 |
| 2010 | .40 | 11.00 |
| 2011 | .00 | 12.00 |
| 2012 | .00 | 12.00 |
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