|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | |
| 1993 | 3.75 | 3.31 |
| 1994 | 3.72 | 3.87 |
| 1995 | 4.29 | 5.82 |
| 1996 | 5.61 | 6.05 |
| 1997 | 5.37 | 7.08 |
| 1998 | 4.70 | 7.44 |
| 1999 | 4.58 | 7.78 |
| 2000 | 4.85 | 8.37 |
| 2001 | 6.04 | 8.71 |
| 2002 | 4.99 | 7.66 |
| 2003 | 5.34 | 7.82 |
| 2004 | 5.74 | 9.01 |
| 2005 | 5.84 | 8.33 |
| 2006 | 6.48 | 7.66 |
| 2007 | 6.10 | 6.77 |
| 2008 | 6.66 | 6.94 |
| 2009 | 6.46 | 6.04 |
| 2010 | 6.84 | 5.91 |
|
|
