|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 23.31 | 22.00 |
| 1993 | 25.71 | 21.03 |
| 1994 | 27.72 | 25.36 |
| 1995 | 21.03 | 16.36 |
| 1996 | 17.18 | 17.18 |
| 1997 | 18.56 | 11.36 |
| 1998 | 21.97 | 17.67 |
| 1999 | 22.67 | 18.70 |
| 2000 | 20.04 | 17.71 |
| 2001 | 17.53 | 10.28 |
| 2002 | 14.26 | 10.40 |
| 2003 | 16.83 | 10.54 |
| 2004 | 19.86 | 10.93 |
| 2005 | 21.03 | 14.49 |
| 2006 | 24.37 | 16.83 |
| 2007 | 26.38 | 18.53 |
| 2008 | 30.85 | 22.25 |
| 2009 | 28.86 | 23.30 |
| 2010 | 29.19 | 24.66 |
|
|