|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .51 | .97 |
| 1987 | .33 | .75 |
| 1988 | .32 | .77 |
| 1989 | .34 | .68 |
| 1990 | .20 | .80 |
| 1991 | .38 | .70 |
| 1992 | .15 | .76 |
| 1993 | .21 | 1.06 |
| 1994 | .21 | 1.25 |
| 1995 | .11 | 1.14 |
| 1996 | .10 | 1.33 |
| 1997 | .18 | 1.52 |
| 1998 | .34 | 1.10 |
| 1999 | .47 | 1.04 |
| 2000 | .44 | 1.03 |
| 2001 | .38 | 1.04 |
| 2002 | .30 | .85 |
| 2003 | | .93 |
| 2004 | | 1.03 |
| 2005 | | .83 |
| 2006 | | .93 |
| 2007 | | .19 |
| 2008 | | .17 |
| 2009 | | .17 |
| 2010 | .02 | .89 |
|
|