|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .67 | 1.38 |
| 1987 | .70 | 1.48 |
| 1988 | .95 | 1.59 |
| 1989 | .84 | 1.49 |
| 1990 | .80 | 1.59 |
| 1991 | .94 | 1.57 |
| 1992 | .91 | 1.80 |
| 1993 | .88 | 1.64 |
| 1994 | 1.04 | 1.46 |
| 1995 | .88 | 1.54 |
| 1996 | .84 | 1.57 |
| 1997 | 1.05 | 1.59 |
| 1998 | .98 | 1.62 |
| 1999 | 1.11 | 1.43 |
| 2000 | .98 | 1.71 |
| 2001 | 1.02 | 1.65 |
| 2002 | 1.08 | 1.68 |
| 2003 | .93 | 1.80 |
| 2004 | .28 | 1.78 |
| 2005 | | 1.49 |
| 2006 | | 1.68 |
| 2007 | | 1.62 |
| 2008 | | 1.65 |
| 2009 | | 1.62 |
| 2010 | | 1.56 |
|
|
