|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 1.05 | .56 |
| 1987 | .81 | .58 |
| 1988 | .60 | 1.00 |
| 1989 | .67 | 1.26 |
| 1990 | .68 | .69 |
| 1991 | .76 | 1.10 |
| 1992 | 1.55 | .73 |
| 1993 | 1.07 | .34 |
| 1994 | 1.11 | .35 |
| 1995 | 1.91 | .75 |
| 1996 | 1.41 | .62 |
| 1997 | 1.21 | 1.15 |
| 1998 | 1.18 | 1.18 |
| 1999 | 1.29 | 1.26 |
| 2000 | 1.37 | .37 |
| 2001 | 1.30 | 1.30 |
| 2002 | 1.02 | 1.02 |
| 2003 | 1.08 | 1.08 |
| 2004 | 1.17 | .98 |
| 2005 | 1.18 | .99 |
| 2006 | 1.21 | 1.24 |
| 2007 | 1.21 | 1.33 |
| 2008 | 1.21 | 1.46 |
| 2009 | 1.21 | 1.59 |
| 2010 | 13.41 | 8.58 |
|
|
