|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | .70 | 1.30 |
| 1993 | .60 | 1.23 |
| 1994 | .07 | .48 |
| 1995 | .04 | .58 |
| 1996 | .24 | .62 |
| 1997 | .11 | .51 |
| 1998 | .31 | .83 |
| 1999 | .24 | 1.02 |
| 2000 | .28 | .92 |
| 2001 | .37 | .67 |
| 2002 | .30 | 1.03 |
| 2003 | .69 | 1.18 |
| 2004 | .66 | 1.30 |
| 2005 | .79 | 1.49 |
| 2006 | .95 | 1.72 |
| 2007 | .79 | 2.03 |
| 2008 | .92 | 2.10 |
| 2009 | .92 | 2.03 |
| 2010 | .79 | 2.00 |
|
|
