|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .01 | .29 |
| 1987 | .01 | .32 |
| 1988 | .00 | .00 |
| 1989 | .00 | .19 |
| 1990 | .01 | .20 |
| 1991 | .01 | .20 |
| 1992 | .07 | .32 |
| 1993 | .07 | .33 |
| 1994 | .07 | .32 |
| 1995 | .01 | .20 |
| 1996 | 1.89 | 1.89 |
| 1997 | .01 | .27 |
| 1998 | .06 | .40 |
| 1999 | .06 | .40 |
| 2000 | | .30 |
| 2001 | | .30 |
| 2002 | | .30 |
| 2003 | | .30 |
| 2004 | .03 | .38 |
| 2005 | | .44 |
| 2006 | | .41 |
| 2007 | | |
| 2008 | | .41 |
| 2009 | | .38 |
| 2010 | .03 | .43 |
|
|
