|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | 4.87 |
| 1987 | | 4.85 |
| 1988 | | 5.49 |
| 1989 | | 5.37 |
| 1990 | | 6.05 |
| 1991 | | 6.60 |
| 1992 | | 7.11 |
| 1993 | | 6.33 |
| 1994 | | 8.51 |
| 1995 | | |
| 1996 | | 8.86 |
| 1997 | | 5.50 |
| 1998 | | 4.87 |
| 1999 | | 8.35 |
| 2000 | | 9.28 |
| 2001 | | 9.72 |
| 2002 | | 7.38 |
| 2003 | | 7.91 |
| 2004 | | 7.88 |
| 2005 | | 7.55 |
| 2006 | | 7.27 |
| 2007 | | 7.71 |
| 2008 | | 7.82 |
| 2009 | | 8.36 |
| 2010 | | 8.69 |
|
|