|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 2.15 | 32.54 |
| 1993 | 1.88 | 19.44 |
| 1994 | 1.53 | 8.76 |
| 1995 | 1.89 | 11.68 |
| 1996 | 1.88 | 12.33 |
| 1997 | 1.70 | 10.27 |
| 1998 | 1.60 | 13.91 |
| 1999 | 1.53 | 11.61 |
| 2000 | | 10.57 |
| 2001 | | 9.25 |
| 2002 | 1.52 | 10.09 |
| 2003 | 1.38 | 9.57 |
| 2004 | 1.40 | 12.23 |
| 2005 | | 13.70 |
| 2006 | | 13.55 |
| 2007 | | 14.31 |
| 2008 | | 25.65 |
| 2009 | | 34.09 |
| 2010 | | 32.61 |
| 2011 | | 17.00 |
|
|