|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | 11.42 |
| 1993 | | 6.18 |
| 1994 | | 4.74 |
| 1995 | | 4.56 |
| 1996 | | 1.75 |
| 1997 | | 1.75 |
| 1998 | | 1.97 |
| 1999 | | 2.03 |
| 2000 | | 2.89 |
| 2001 | | 2.90 |
| 2002 | | 3.03 |
| 2003 | | 3.27 |
| 2004 | | 3.38 |
| 2005 | | 3.54 |
| 2006 | 1.39 | 4.45 |
| 2007 | 1.06 | 4.51 |
| 2008 | 1.64 | 4.56 |
| 2009 | 5.46 | 4.31 |
| 2010 | 4.97 | 3.76 |
|
|