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Loading...
| year | production | consumption |
| 1980 | 2.50 | 2.50 |
| 1981 | 2.10 | 2.10 |
| 1982 | 2.00 | 2.00 |
| 1983 | 5.30 | 5.30 |
| 1984 | 5.30 | 5.30 |
| 1985 | 2.00 | 2.00 |
| 1986 | 1.00 | 1.00 |
| 1987 | 4.10 | 4.10 |
| 1988 | 3.50 | 3.50 |
| 1989 | 3.20 | 3.20 |
| 1990 | 3.00 | 3.00 |
| 1991 | 3.50 | 3.50 |
| 1992 | 3.50 | 3.50 |
| 1993 | 3.50 | 3.50 |
| 1994 | 3.50 | 3.50 |
| 1995 | 3.50 | 3.50 |
| 1996 | 3.50 | 3.50 |
| 1997 | 3.50 | 3.50 |
| 1998 | 3.50 | 3.50 |
| 1999 | 3.50 | 3.50 |
| 2000 | 2.80 | 2.80 |
| 2001 | 2.80 | 2.80 |
| 2002 | 3.20 | 3.20 |
| 2003 | 3.20 | 3.20 |
| 2004 | 3.50 | 3.50 |
| 2005 | 3.50 | 3.50 |
| 2006 | 3.50 | 3.50 |
| 2007 | 2.80 | 2.80 |
| 2008 | 2.80 | 2.80 |
| 2009 | 2.80 | 2.80 |
| 2010 | 2.80 | 2.80 |
| 2011 | 2.50 | 2.50 |
| 2012 | -38.00 | 14.00 |
| 2013 | 14.00 | 14.00 |
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