|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | .15 |
| 1988 | | .15 |
| 1989 | | .16 |
| 1990 | | .19 |
| 1991 | .21 | .32 |
| 1992 | .42 | .24 |
| 1993 | .17 | .17 |
| 1994 | .15 | .15 |
| 1995 | 1.36 | .22 |
| 1996 | .53 | .37 |
| 1997 | .21 | .21 |
| 1998 | 1.63 | .25 |
| 1999 | 1.63 | .38 |
| 2000 | 1.52 | .25 |
| 2001 | .95 | .10 |
| 2002 | .61 | .23 |
| 2003 | | .28 |
| 2004 | | .53 |
| 2005 | | .11 |
| 2006 | | 4.70 |
| 2007 | | .02 |
| 2008 | | .04 |
| 2009 | | .70 |
| 2010 | | .49 |
|
|