|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .39 | .43 |
| 1987 | .32 | .37 |
| 1988 | .34 | .39 |
| 1989 | .34 | .39 |
| 1990 | .35 | .41 |
| 1991 | .21 | .25 |
| 1992 | .25 | .30 |
| 1993 | .25 | .30 |
| 1994 | .25 | .30 |
| 1995 | .25 | .30 |
| 1996 | .25 | .30 |
| 1997 | .25 | .30 |
| 1998 | .25 | .30 |
| 1999 | .25 | .30 |
| 2000 | | .30 |
| 2001 | | .30 |
| 2002 | | .30 |
| 2003 | | .30 |
| 2004 | | .30 |
| 2005 | | .40 |
| 2006 | .51 | .60 |
| 2007 | .46 | .55 |
| 2008 | .46 | .58 |
| 2009 | | .71 |
| 2010 | | .71 |
|
|