|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .20 | .10 |
| 1987 | .24 | .11 |
| 1988 | .27 | .08 |
| 1989 | .14 | .08 |
| 1990 | .34 | .34 |
| 1991 | .33 | .33 |
| 1992 | .34 | .32 |
| 1993 | .33 | .33 |
| 1994 | .33 | .33 |
| 1995 | .33 | .33 |
| 1996 | .33 | .33 |
| 1997 | .33 | .33 |
| 1998 | .33 | .33 |
| 1999 | .13 | .32 |
| 2000 | .00 | .00 |
| 2001 | .11 | .11 |
| 2002 | .11 | .11 |
| 2003 | .11 | .11 |
| 2004 | .11 | .11 |
| 2005 | .11 | .11 |
| 2006 | .11 | .11 |
| 2007 | .10 | .10 |
| 2008 | .10 | .10 |
| 2009 | .11 | .11 |
| 2010 | .14 | .14 |
|
|