|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | 5.64 |
| 1993 | | 1.46 |
| 1994 | | 1.59 |
| 1995 | | 2.65 |
| 1996 | | 2.90 |
| 1997 | .01 | 2.91 |
| 1998 | .00 | 3.61 |
| 1999 | .00 | .61 |
| 2000 | .00 | .40 |
| 2001 | .00 | 4.02 |
| 2002 | .00 | .53 |
| 2003 | .00 | .51 |
| 2004 | .00 | .51 |
| 2005 | .00 | .50 |
| 2006 | .00 | .51 |
| 2007 | | .53 |
| 2008 | | 2.39 |
| 2009 | .01 | 2.09 |
| 2010 | .01 | 2.05 |
|
|