|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 4.24 | 3.39 |
| 1987 | | |
| 1988 | 4.65 | 3.88 |
| 1989 | 5.63 | 4.34 |
| 1990 | 6.84 | 3.41 |
| 1991 | 6.93 | 4.80 |
| 1992 | 6.76 | 6.82 |
| 1993 | 7.84 | 4.96 |
| 1994 | 8.37 | 6.46 |
| 1995 | 10.80 | 8.68 |
| 1996 | 9.78 | 5.64 |
| 1997 | 9.54 | 11.68 |
| 1998 | 12.71 | 10.44 |
| 1999 | 11.56 | 7.33 |
| 2000 | 17.30 | 14.38 |
| 2001 | 12.81 | 14.61 |
| 2002 | 12.30 | 13.47 |
| 2003 | | |
| 2004 | 3.36 | 3.35 |
| 2005 | 3.37 | 11.93 |
| 2006 | 7.39 | 5.04 |
| 2007 | 28.21 | 23.51 |
| 2008 | | |
| 2009 | 12.30 | 7.69 |
| 2010 | 28.61 | 23.78 |
|
|