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Loading...
| year | production | consumption |
| 1986 | 6.40 | 6.40 |
| 1987 | 6.30 | 6.30 |
| 1988 | 6.40 | 6.40 |
| 1989 | 6.50 | 6.50 |
| 1990 | 6.60 | 6.60 |
| 1991 | 6.60 | 6.60 |
| 1992 | 6.70 | 6.70 |
| 1993 | 6.60 | 6.60 |
| 1994 | 6.50 | 6.50 |
| 1995 | 6.40 | 6.40 |
| 1996 | 6.50 | 6.50 |
| 1997 | 9.90 | 9.00 |
| 1998 | 9.70 | 10.00 |
| 1999 | 12.00 | 14.00 |
| 2000 | 11.00 | 13.00 |
| 2001 | 10.00 | 15.00 |
| 2002 | 14.00 | 16.00 |
| 2003 | 14.00 | 20.00 |
| 2004 | 14.00 | 19.00 |
| 2005 | 14.00 | 23.00 |
| 2006 | 14.00 | 27.00 |
| 2007 | 10.00 | 33.00 |
| 2008 | 11.00 | 33.00 |
| 2009 | 10.00 | 27.00 |
| 2010 | 11.00 | 51.00 |
| 2011 | 11.00 | 51.00 |
| 2012 | 11.00 | 55.00 |
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