|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 12.17 | 10.49 |
| 1987 | 12.10 | 9.16 |
| 1988 | 11.81 | 8.28 |
| 1989 | 12.13 | 7.49 |
| 1990 | 12.89 | 7.55 |
| 1991 | 12.44 | 7.57 |
| 1992 | 12.99 | 8.04 |
| 1993 | 12.78 | 7.25 |
| 1994 | 12.06 | 10.34 |
| 1995 | 10.12 | 8.11 |
| 1996 | 9.77 | 8.17 |
| 1997 | 9.54 | 10.98 |
| 1998 | 9.70 | 8.63 |
| 1999 | 9.75 | 9.31 |
| 2000 | 11.75 | 9.89 |
| 2001 | 10.22 | 9.78 |
| 2002 | 10.15 | 9.09 |
| 2003 | 10.00 | 10.31 |
| 2004 | 11.73 | 8.84 |
| 2005 | 10.45 | 10.71 |
| 2006 | 11.31 | 11.62 |
| 2007 | 9.74 | 10.55 |
| 2008 | 9.40 | 12.61 |
| 2009 | 9.50 | 9.20 |
| 2010 | 8.62 | 12.36 |
|
|