|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .13 | .42 |
| 1987 | .20 | .52 |
| 1988 | .17 | .42 |
| 1989 | .21 | .48 |
| 1990 | .21 | .35 |
| 1991 | .16 | .42 |
| 1992 | .17 | .45 |
| 1993 | | .64 |
| 1994 | | .79 |
| 1995 | | .78 |
| 1996 | | 1.42 |
| 1997 | | .87 |
| 1998 | | 1.04 |
| 1999 | | 1.24 |
| 2000 | | 1.35 |
| 2001 | | 1.53 |
| 2002 | | 1.65 |
| 2003 | | 1.75 |
| 2004 | | 1.65 |
| 2005 | | 2.48 |
| 2006 | | 3.34 |
| 2007 | | 2.89 |
| 2008 | | 2.48 |
| 2009 | | 1.84 |
| 2010 | | 2.70 |
|
|
