|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | |
| 1993 | | |
| 1994 | 4.34 | 1.84 |
| 1995 | 3.47 | 2.20 |
| 1996 | 3.51 | 2.30 |
| 1997 | 3.52 | 2.40 |
| 1998 | | 2.53 |
| 1999 | | 2.74 |
| 2000 | | 2.26 |
| 2001 | | 2.39 |
| 2002 | | 2.17 |
| 2003 | | 2.60 |
| 2004 | | 2.32 |
| 2005 | | 2.00 |
| 2006 | | 1.88 |
| 2007 | | 1.86 |
| 2008 | | 1.06 |
| 2009 | | 1.55 |
| 2010 | | 1.53 |
|
|