|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .98 | .98 |
| 1987 | .99 | .84 |
| 1988 | .89 | .72 |
| 1989 | .87 | .87 |
| 1990 | .82 | .64 |
| 1991 | .74 | .62 |
| 1992 | .60 | .68 |
| 1993 | .63 | .08 |
| 1994 | .76 | .45 |
| 1995 | .82 | .72 |
| 1996 | .67 | .52 |
| 1997 | .53 | .50 |
| 1998 | .70 | .55 |
| 1999 | .51 | .51 |
| 2000 | .61 | .61 |
| 2001 | .44 | .36 |
| 2002 | .59 | .59 |
| 2003 | .57 | .57 |
| 2004 | .51 | .51 |
| 2005 | .85 | .85 |
| 2006 | .44 | .44 |
| 2007 | .49 | .49 |
| 2008 | .55 | .55 |
| 2009 | .34 | .34 |
| 2010 | .34 | .34 |
|
|