|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | 8.23 |
| 1993 | | 5.93 |
| 1994 | | 6.24 |
| 1995 | | 7.34 |
| 1996 | | 8.01 |
| 1997 | | 9.48 |
| 1998 | | 10.28 |
| 1999 | | 23.28 |
| 2000 | | 15.68 |
| 2001 | | 2.34 |
| 2002 | | 20.50 |
| 2003 | | 22.36 |
| 2004 | | 24.17 |
| 2005 | | 26.24 |
| 2006 | | 28.46 |
| 2007 | | 33.58 |
| 2008 | | 1.99 |
| 2009 | | 1.85 |
| 2010 | | 2.01 |
|
|