|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | 4.10 |
| 1991 | | |
| 1992 | | 1.55 |
| 1993 | | 1.84 |
| 1994 | | 1.69 |
| 1995 | | 1.69 |
| 1996 | | 1.68 |
| 1997 | | 1.69 |
| 1998 | | 1.69 |
| 1999 | | 7.36 |
| 2000 | | 5.52 |
| 2001 | | 7.81 |
| 2002 | | 8.01 |
| 2003 | | 8.30 |
| 2004 | | 8.76 |
| 2005 | | 8.79 |
| 2006 | | 9.54 |
| 2007 | | 10.04 |
| 2008 | | 10.22 |
| 2009 | | 11.00 |
| 2010 | | 11.79 |
|
|