|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | .17 |
| 1987 | .19 | .19 |
| 1988 | | .21 |
| 1989 | .29 | .29 |
| 1990 | .25 | .25 |
| 1991 | .25 | .26 |
| 1992 | .30 | .36 |
| 1993 | .30 | .35 |
| 1994 | .32 | .32 |
| 1995 | .30 | .36 |
| 1996 | .21 | .32 |
| 1997 | .42 | .42 |
| 1998 | .49 | .44 |
| 1999 | .42 | .42 |
| 2000 | .40 | .51 |
| 2001 | .51 | .51 |
| 2002 | .61 | .66 |
| 2003 | .80 | .70 |
| 2004 | .22 | .50 |
| 2005 | | .34 |
| 2006 | | .21 |
| 2007 | | .30 |
| 2008 | | .34 |
| 2009 | | .40 |
| 2010 | | .17 |
|
|