|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | 12.03 |
| 1993 | | 10.59 |
| 1994 | | 7.62 |
| 1995 | | 7.81 |
| 1996 | | 6.64 |
| 1997 | | 6.38 |
| 1998 | | 5.07 |
| 1999 | | 3.62 |
| 2000 | | 8.68 |
| 2001 | | 13.31 |
| 2002 | | 14.31 |
| 2003 | | 5.95 |
| 2004 | | 6.73 |
| 2005 | | 6.81 |
| 2006 | | 6.85 |
| 2007 | | 7.13 |
| 2008 | .08 | 7.54 |
| 2009 | .10 | 6.83 |
| 2010 | .08 | 8.56 |
|
|