|
| year | production | consumption |
| 1980 | | 1.10 |
| 1981 | | 1.10 |
| 1982 | | 26.46 |
| 1983 | | 57.32 |
| 1984 | | 103.62 |
| 1985 | | 233.69 |
| 1986 | | 160.94 |
| 1987 | | 200.62 |
| 1988 | | 270.07 |
| 1989 | | 334.00 |
| 1990 | | 330.69 |
| 1991 | | 267.86 |
| 1992 | | 225.97 |
| 1993 | | 330.69 |
| 1994 | | 231.49 |
| 1995 | | 40.79 |
| 1996 | | |
| 1997 | | |
| 1998 | | |
| 1999 | | |
| 2000 | | |
| 2001 | | |
| 2002 | | |
| 2003 | | |
| 2004 | | |
| 2005 | | |
| 2006 | | |
| 2007 | | |
| 2008 | | |
| 2009 | | |
| 2010 | | |
| 2011 | | |
|
|