|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .70 | .70 |
| 1987 | .54 | .54 |
| 1988 | .79 | 1.84 |
| 1989 | .82 | .82 |
| 1990 | .82 | .82 |
| 1991 | .84 | .84 |
| 1992 | .61 | .63 |
| 1993 | .65 | .68 |
| 1994 | .80 | .83 |
| 1995 | .65 | .70 |
| 1996 | .65 | .70 |
| 1997 | .65 | .70 |
| 1998 | .68 | .72 |
| 1999 | .68 | .72 |
| 2000 | .68 | .75 |
| 2001 | | .82 |
| 2002 | .70 | .82 |
| 2003 | .72 | .84 |
| 2004 | .75 | .51 |
| 2005 | .77 | .91 |
| 2006 | .77 | 1.52 |
| 2007 | .77 | 1.31 |
| 2008 | .77 | 1.68 |
| 2009 | | 2.10 |
| 2010 | | 2.10 |
|
|