|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | 7.95 |
| 1993 | | 5.66 |
| 1994 | | 1.78 |
| 1995 | | 2.72 |
| 1996 | | 2.71 |
| 1997 | .00 | 2.04 |
| 1998 | .00 | 1.66 |
| 1999 | 1.10 | 2.80 |
| 2000 | .69 | 7.29 |
| 2001 | .88 | 7.84 |
| 2002 | .55 | 1.74 |
| 2003 | .47 | 1.98 |
| 2004 | .55 | 2.79 |
| 2005 | .55 | 2.51 |
| 2006 | .63 | 2.64 |
| 2007 | 1.06 | 3.27 |
| 2008 | 1.23 | 3.64 |
| 2009 | .20 | 11.24 |
| 2010 | | 11.45 |
|
|