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| year | production | consumption |
| 1980 | .80 | .80 |
| 1981 | 1.00 | 1.00 |
| 1982 | 1.00 | 1.00 |
| 1983 | 1.00 | 1.00 |
| 1984 | 11.00 | 10.00 |
| 1985 | 10.00 | 10.00 |
| 1986 | 9.70 | 9.80 |
| 1987 | 10.00 | 10.00 |
| 1988 | 11.00 | 9.80 |
| 1989 | 11.00 | 9.90 |
| 1990 | 11.00 | 11.00 |
| 1991 | 9.80 | 9.60 |
| 1992 | 10.00 | 9.00 |
| 1993 | 10.00 | 9.00 |
| 1994 | 9.60 | 8.50 |
| 1995 | 6.70 | 9.50 |
| 1996 | 2.70 | 11.00 |
| 1997 | 2.30 | 10.00 |
| 1998 | 2.20 | 11.00 |
| 1999 | 2.30 | 11.00 |
| 2000 | 2.40 | 11.00 |
| 2001 | 2.50 | 9.40 |
| 2002 | 2.90 | 9.80 |
| 2003 | 3.00 | 9.70 |
| 2004 | 2.90 | 9.90 |
| 2005 | 2.60 | 11.00 |
| 2006 | 2.60 | 11.00 |
| 2007 | 2.60 | 9.80 |
| 2008 | 2.70 | 9.50 |
| 2009 | 2.30 | 9.20 |
| 2010 | 2.40 | 11.00 |
| 2011 | 2.40 | 11.00 |
| 2012 | 2.00 | 10.00 |
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