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| year | production | consumption |
| 1986 | 8.30 | 2.50 |
| 1987 | 3.50 | 2.90 |
| 1988 | 3.20 | 3.40 |
| 1989 | 3.80 | 4.00 |
| 1990 | 4.10 | 3.90 |
| 1991 | 3.60 | 3.00 |
| 1992 | 2.90 | 2.90 |
| 1993 | 2.60 | 3.60 |
| 1994 | 2.70 | 5.20 |
| 1995 | 2.40 | 5.20 |
| 1996 | 2.40 | 5.40 |
| 1997 | 2.10 | 3.20 |
| 1998 | 2.60 | 6.70 |
| 1999 | 2.20 | 6.50 |
| 2000 | 2.50 | 9.60 |
| 2001 | 2.00 | 7.80 |
| 2002 | 1.70 | 7.60 |
| 2003 | 1.90 | 5.80 |
| 2004 | 2.00 | 7.40 |
| 2005 | 1.90 | 8.50 |
| 2006 | 2.50 | 9.40 |
| 2007 | 2.20 | 9.70 |
| 2008 | 2.00 | 5.20 |
| 2009 | 2.30 | 7.10 |
| 2010 | 2.20 | 6.70 |
| 2011 | 2.50 | 5.70 |
| 2012 | 1.40 | 6.50 |
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