|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 10.81 | 10.78 |
| 1987 | 11.88 | 10.31 |
| 1988 | 11.24 | 11.89 |
| 1989 | 11.49 | 11.64 |
| 1990 | 11.61 | 12.11 |
| 1991 | 11.09 | 9.29 |
| 1992 | 11.84 | 11.65 |
| 1993 | 10.83 | 11.83 |
| 1994 | 11.02 | 10.96 |
| 1995 | 9.74 | 13.91 |
| 1996 | 8.61 | 13.72 |
| 1997 | 8.43 | 14.17 |
| 1998 | 8.78 | 13.18 |
| 1999 | 8.82 | 12.31 |
| 2000 | 10.42 | 13.77 |
| 2001 | 8.92 | 12.41 |
| 2002 | 8.28 | 12.86 |
| 2003 | 8.41 | 15.13 |
| 2004 | 7.89 | 19.70 |
| 2005 | 7.65 | 19.71 |
| 2006 | 7.53 | 22.04 |
| 2007 | 8.11 | 22.65 |
| 2008 | 7.64 | 23.93 |
| 2009 | 7.98 | 29.44 |
| 2010 | 8.04 | 27.45 |
|
|