|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | .41 |
| 1987 | | .16 |
| 1988 | | .16 |
| 1989 | | .29 |
| 1990 | | .60 |
| 1991 | | .57 |
| 1992 | | .48 |
| 1993 | | .57 |
| 1994 | | .38 |
| 1995 | | .60 |
| 1996 | | .60 |
| 1997 | | .62 |
| 1998 | | .64 |
| 1999 | | .64 |
| 2000 | .01 | .66 |
| 2001 | .01 | .68 |
| 2002 | .01 | .68 |
| 2003 | .01 | .68 |
| 2004 | .01 | .71 |
| 2005 | .01 | .74 |
| 2006 | .01 | .77 |
| 2007 | | .76 |
| 2008 | | .76 |
| 2009 | .01 | .77 |
| 2010 | .01 | .77 |
|
|