|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .25 | .38 |
| 1987 | .15 | .15 |
| 1988 | .35 | .46 |
| 1989 | .26 | .50 |
| 1990 | .25 | .47 |
| 1991 | .24 | .80 |
| 1992 | .46 | 1.27 |
| 1993 | .51 | 1.31 |
| 1994 | | |
| 1995 | .53 | 1.44 |
| 1996 | .55 | 1.46 |
| 1997 | .55 | 1.46 |
| 1998 | .57 | 1.52 |
| 1999 | .23 | 1.06 |
| 2000 | .76 | .76 |
| 2001 | .64 | .64 |
| 2002 | .72 | .72 |
| 2003 | .76 | .76 |
| 2004 | .87 | .87 |
| 2005 | .95 | .95 |
| 2006 | 1.25 | 1.25 |
| 2007 | 1.36 | 1.36 |
| 2008 | .32 | .32 |
| 2009 | .08 | .06 |
| 2010 | .53 | .06 |
|
|