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| year | production | consumption |
| 1986 | 3.90 | 4.20 |
| 1987 | 4.10 | 4.40 |
| 1988 | 3.90 | 3.90 |
| 1989 | 4.10 | 4.30 |
| 1990 | 4.20 | 4.30 |
| 1991 | 4.00 | 4.20 |
| 1992 | 2.70 | 2.80 |
| 1993 | 2.70 | 2.90 |
| 1994 | 2.60 | 3.10 |
| 1995 | 3.00 | 3.00 |
| 1996 | 2.80 | 2.90 |
| 1997 | 1.90 | 2.90 |
| 1998 | 1.60 | 3.30 |
| 1999 | 1.70 | 3.10 |
| 2000 | 3.00 | 4.10 |
| 2001 | 2.90 | 4.60 |
| 2002 | 2.20 | 4.70 |
| 2003 | 3.00 | 5.60 |
| 2004 | 2.00 | 5.70 |
| 2005 | 2.60 | 6.10 |
| 2006 | 2.00 | 5.30 |
| 2007 | 1.90 | 3.50 |
| 2008 | 1.80 | 3.60 |
| 2009 | .90 | 3.80 |
| 2010 | 1.10 | 4.10 |
| 2011 | .90 | 3.70 |
| 2012 | .90 | 3.70 |
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