|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .04 | .04 |
| 1987 | .02 | .02 |
| 1988 | .03 | .04 |
| 1989 | .03 | .04 |
| 1990 | .02 | .02 |
| 1991 | .01 | .39 |
| 1992 | .04 | .42 |
| 1993 | .04 | .42 |
| 1994 | .04 | .42 |
| 1995 | .04 | .07 |
| 1996 | .05 | .08 |
| 1997 | .01 | .39 |
| 1998 | .01 | .39 |
| 1999 | .00 | .03 |
| 2000 | .00 | .03 |
| 2001 | .00 | .00 |
| 2002 | | |
| 2003 | | |
| 2004 | | |
| 2005 | | |
| 2006 | | |
| 2007 | | |
| 2008 | | |
| 2009 | | |
| 2010 | | |
|
|