|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | 2.60 |
| 1987 | | 1.32 |
| 1988 | | 1.67 |
| 1989 | | 1.59 |
| 1990 | | .98 |
| 1991 | | .72 |
| 1992 | | .71 |
| 1993 | | .78 |
| 1994 | | .78 |
| 1995 | | .78 |
| 1996 | | .79 |
| 1997 | | .82 |
| 1998 | | .82 |
| 1999 | | .82 |
| 2000 | | .92 |
| 2001 | | .92 |
| 2002 | | .98 |
| 2003 | | 1.02 |
| 2004 | | 1.04 |
| 2005 | | 1.12 |
| 2006 | | 1.43 |
| 2007 | | 1.78 |
| 2008 | | 1.59 |
| 2009 | | .91 |
| 2010 | | .91 |
|
|