|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | |
| 1993 | | |
| 1994 | | |
| 1995 | | |
| 1996 | | |
| 1997 | | |
| 1998 | | |
| 1999 | | |
| 2000 | | 12.36 |
| 2001 | | 22.25 |
| 2002 | | 22.25 |
| 2003 | | 26.13 |
| 2004 | | 24.01 |
| 2005 | | 23.66 |
| 2006 | | 25.43 |
| 2007 | | 26.00 |
| 2008 | | 28.49 |
| 2009 | | 26.72 |
| 2010 | | 27.19 |
| 2011 | | 26.49 |
|
|