|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 4.56 | 4.56 |
| 1987 | 4.68 | 4.78 |
| 1988 | 4.74 | 5.35 |
| 1989 | 4.62 | 5.38 |
| 1990 | 4.02 | 5.91 |
| 1991 | 4.11 | 6.26 |
| 1992 | 4.51 | 6.47 |
| 1993 | 4.37 | 6.64 |
| 1994 | 4.31 | 8.51 |
| 1995 | 3.54 | 8.71 |
| 1996 | 5.60 | 8.92 |
| 1997 | 6.60 | 9.00 |
| 1998 | 7.89 | 9.49 |
| 1999 | 6.67 | 11.37 |
| 2000 | 7.15 | 22.00 |
| 2001 | 6.58 | 14.34 |
| 2002 | 6.58 | 14.24 |
| 2003 | 6.55 | 15.67 |
| 2004 | 7.35 | 12.58 |
| 2005 | 7.15 | 12.53 |
| 2006 | 24.69 | 23.33 |
| 2007 | 6.32 | 25.84 |
| 2008 | 6.58 | 29.30 |
| 2009 | 5.82 | 32.08 |
| 2010 | 6.48 | 35.74 |
|
|
