|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | |
| 1993 | | |
| 1994 | | |
| 1995 | 1.41 | 1.41 |
| 1996 | 19.42 | 19.42 |
| 1997 | 21.19 | 21.19 |
| 1998 | 28.25 | 28.25 |
| 1999 | 47.32 | 47.32 |
| 2000 | 47.68 | 47.68 |
| 2001 | 47.68 | 47.68 |
| 2002 | 47.32 | 47.32 |
| 2003 | 47.32 | 47.32 |
| 2004 | 45.91 | 45.91 |
| 2005 | 45.91 | 45.91 |
| 2006 | 45.91 | 45.91 |
| 2007 | 52.97 | 52.97 |
| 2008 | 56.50 | 56.50 |
| 2009 | 56.50 | 56.50 |
| 2010 | 52.97 | 52.97 |
| 2011 | 52.97 | 52.97 |
|
|