|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 9.40 | 9.40 |
| 1987 | 9.00 | 9.00 |
| 1988 | 8.90 | 8.90 |
| 1989 | 13.74 | 13.74 |
| 1990 | 7.75 | 7.75 |
| 1991 | 7.54 | 7.10 |
| 1992 | 7.60 | 6.99 |
| 1993 | 8.18 | 13.48 |
| 1994 | 8.63 | 8.54 |
| 1995 | 9.30 | 9.21 |
| 1996 | 8.73 | 8.44 |
| 1997 | 8.05 | 8.24 |
| 1998 | 10.02 | 9.67 |
| 1999 | 8.60 | 9.11 |
| 2000 | 10.81 | 9.23 |
| 2001 | 10.71 | 10.30 |
| 2002 | 10.93 | 11.48 |
| 2003 | 10.39 | 11.26 |
| 2004 | 11.60 | 12.71 |
| 2005 | 20.91 | 17.42 |
| 2006 | 21.52 | 20.35 |
| 2007 | 23.96 | 23.10 |
| 2008 | 18.88 | 17.80 |
| 2009 | 23.84 | 20.45 |
| 2010 | 18.12 | 15.12 |
|
|
