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| year | production | consumption |
| 1986 | 19.60 | 25.20 |
| 1987 | 19.60 | 21.60 |
| 1988 | 20.50 | 21.20 |
| 1989 | 17.30 | 19.50 |
| 1990 | 21.30 | 18.30 |
| 1991 | 21.70 | 17.30 |
| 1992 | 23.80 | 25.50 |
| 1993 | 23.80 | 22.10 |
| 1994 | 19.10 | 25.60 |
| 1995 | 21.20 | 25.40 |
| 1996 | 19.50 | 25.80 |
| 1997 | 13.30 | 17.30 |
| 1998 | 11.20 | 15.50 |
| 1999 | 10.10 | 16.80 |
| 2000 | 14.60 | 21.20 |
| 2001 | 9.70 | 17.60 |
| 2002 | 8.90 | 15.20 |
| 2003 | 8.20 | 16.60 |
| 2004 | 9.90 | 20.20 |
| 2005 | 11.10 | 19.40 |
| 2006 | 9.30 | 22.80 |
| 2007 | 9.50 | 25.40 |
| 2008 | 6.30 | 15.20 |
| 2009 | 5.40 | 14.20 |
| 2010 | 4.60 | 14.30 |
| 2011 | .90 | 6.40 |
| 2012 | .90 | 7.60 |
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