|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .65 | .36 |
| 1987 | .70 | .70 |
| 1988 | .87 | .87 |
| 1989 | .90 | .80 |
| 1990 | .83 | .83 |
| 1991 | .64 | .64 |
| 1992 | .89 | .89 |
| 1993 | .68 | .68 |
| 1994 | .64 | .64 |
| 1995 | .68 | .68 |
| 1996 | .65 | .65 |
| 1997 | .68 | .68 |
| 1998 | .66 | .66 |
| 1999 | .28 | .68 |
| 2000 | .02 | .32 |
| 2001 | .47 | .34 |
| 2002 | .49 | .34 |
| 2003 | .51 | .36 |
| 2004 | .55 | .38 |
| 2005 | .59 | .40 |
| 2006 | .59 | .32 |
| 2007 | .68 | .32 |
| 2008 | .47 | .44 |
| 2009 | .47 | .47 |
| 2010 | .64 | .38 |
|
|