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| year | production | consumption |
| 1986 | 9.00 | 9.00 |
| 1987 | 6.70 | 6.70 |
| 1988 | 6.60 | 6.60 |
| 1989 | 6.50 | 6.50 |
| 1990 | 5.10 | 4.50 |
| 1991 | 2.50 | 2.50 |
| 1992 | 6.60 | 6.60 |
| 1993 | 2.30 | 2.50 |
| 1994 | 2.30 | 2.10 |
| 1995 | 2.20 | 2.30 |
| 1996 | 2.00 | 2.00 |
| 1997 | 2.20 | 4.20 |
| 1998 | 2.20 | 7.20 |
| 1999 | 1.30 | 2.10 |
| 2000 | 1.50 | 8.40 |
| 2001 | 1.30 | 11.00 |
| 2002 | 1.30 | 9.90 |
| 2003 | 1.90 | 12.00 |
| 2004 | 1.50 | 12.00 |
| 2005 | 1.50 | 14.00 |
| 2006 | 2.00 | 12.00 |
| 2007 | 1.70 | 13.00 |
| 2008 | 1.70 | 16.00 |
| 2009 | 1.50 | 9.20 |
| 2010 | .40 | 13.00 |
| 2011 | 1.70 | 15.00 |
| 2012 | .40 | 14.00 |
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