|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 6.05 | |
| 1993 | 5.73 | 5.60 |
| 1994 | 1.12 | 1.12 |
| 1995 | .82 | 4.91 |
| 1996 | 2.65 | 6.32 |
| 1997 | 3.54 | 7.48 |
| 1998 | 5.60 | 6.21 |
| 1999 | 4.11 | 6.56 |
| 2000 | 5.28 | 6.34 |
| 2001 | 4.58 | 5.33 |
| 2002 | 3.52 | 5.81 |
| 2003 | 6.18 | 6.81 |
| 2004 | 7.32 | 6.93 |
| 2005 | 8.06 | 7.07 |
| 2006 | 8.65 | 7.17 |
| 2007 | 8.67 | 7.44 |
| 2008 | 9.22 | 7.09 |
| 2009 | 7.67 | 7.66 |
| 2010 | 7.30 | 7.95 |
|
|
