|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | .74 |
| 1987 | | .60 |
| 1988 | | .87 |
| 1989 | | .72 |
| 1990 | | .89 |
| 1991 | | .93 |
| 1992 | | .95 |
| 1993 | | 1.02 |
| 1994 | | 1.06 |
| 1995 | | 1.04 |
| 1996 | | 1.03 |
| 1997 | | 1.06 |
| 1998 | | 1.02 |
| 1999 | | 1.02 |
| 2000 | | 1.06 |
| 2001 | | 1.10 |
| 2002 | | .95 |
| 2003 | | .80 |
| 2004 | | .84 |
| 2005 | | 1.06 |
| 2006 | | 1.02 |
| 2007 | | .85 |
| 2008 | | 1.55 |
| 2009 | | 1.26 |
| 2010 | | 1.26 |
|
|