|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .51 | .61 |
| 1987 | .51 | .61 |
| 1988 | .61 | .73 |
| 1989 | .55 | .67 |
| 1990 | .61 | .74 |
| 1991 | .58 | .70 |
| 1992 | .58 | .70 |
| 1993 | .61 | .74 |
| 1994 | .61 | .74 |
| 1995 | .61 | .74 |
| 1996 | .67 | .83 |
| 1997 | 1.16 | 1.32 |
| 1998 | .97 | 1.89 |
| 1999 | .95 | 1.78 |
| 2000 | 1.00 | 1.76 |
| 2001 | 1.04 | 2.18 |
| 2002 | 1.29 | 2.50 |
| 2003 | 1.33 | 2.73 |
| 2004 | .95 | 2.59 |
| 2005 | .85 | 2.76 |
| 2006 | .82 | 3.17 |
| 2007 | .89 | 5.37 |
| 2008 | .83 | 4.58 |
| 2009 | .85 | 5.27 |
| 2010 | 1.07 | 5.20 |
|
|
