|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | .49 |
| 1988 | | 1.17 |
| 1989 | | 1.12 |
| 1990 | | 1.33 |
| 1991 | | 2.00 |
| 1992 | | .13 |
| 1993 | | 1.92 |
| 1994 | | 1.92 |
| 1995 | | 1.90 |
| 1996 | | 1.89 |
| 1997 | | 1.90 |
| 1998 | | 1.79 |
| 1999 | | 1.79 |
| 2000 | | 1.84 |
| 2001 | | 1.82 |
| 2002 | | 1.84 |
| 2003 | | 1.84 |
| 2004 | | 1.91 |
| 2005 | | 1.97 |
| 2006 | | 2.48 |
| 2007 | | 2.50 |
| 2008 | | 2.52 |
| 2009 | | 2.74 |
| 2010 | | 2.74 |
|
|