|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | 8.10 |
| 1993 | | 6.54 |
| 1994 | | 5.84 |
| 1995 | | 5.73 |
| 1996 | | 2.68 |
| 1997 | | 2.69 |
| 1998 | | 3.04 |
| 1999 | | 3.13 |
| 2000 | | 5.59 |
| 2001 | | 5.61 |
| 2002 | | 5.87 |
| 2003 | | 6.36 |
| 2004 | | 7.41 |
| 2005 | | 7.97 |
| 2006 | .42 | 6.52 |
| 2007 | .33 | 7.03 |
| 2008 | .49 | 7.41 |
| 2009 | 2.27 | 7.15 |
| 2010 | 2.06 | 6.10 |
|
|