|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .38 | .38 |
| 1987 | .38 | .38 |
| 1988 | .40 | .40 |
| 1989 | .42 | .42 |
| 1990 | .38 | .38 |
| 1991 | .42 | .42 |
| 1992 | .13 | .13 |
| 1993 | .15 | .15 |
| 1994 | .24 | .24 |
| 1995 | .17 | .17 |
| 1996 | .17 | .17 |
| 1997 | .17 | .17 |
| 1998 | .17 | .17 |
| 1999 | .17 | .17 |
| 2000 | .19 | .25 |
| 2001 | | .25 |
| 2002 | .19 | .28 |
| 2003 | .21 | .30 |
| 2004 | .21 | .68 |
| 2005 | .38 | .38 |
| 2006 | .23 | .74 |
| 2007 | .23 | .76 |
| 2008 | .25 | .80 |
| 2009 | | 3.18 |
| 2010 | | 3.18 |
|
|