|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 35.91 | 65.44 |
| 1993 | 35.51 | 62.82 |
| 1994 | 39.46 | 78.63 |
| 1995 | 32.00 | 88.46 |
| 1996 | 30.00 | 77.88 |
| 1997 | 29.37 | 80.86 |
| 1998 | 31.16 | 89.61 |
| 1999 | 25.00 | 90.90 |
| 2000 | 24.00 | 85.54 |
| 2001 | 23.00 | 85.54 |
| 2002 | 22.00 | 89.49 |
| 2003 | 22.00 | 91.34 |
| 2004 | 20.25 | 95.50 |
| 2005 | 18.66 | 95.76 |
| 2006 | 16.75 | 103.33 |
| 2007 | 15.09 | 98.02 |
| 2008 | 13.67 | 95.26 |
| 2009 | 15.58 | 90.16 |
| 2010 | 14.58 | 82.77 |
| 2011 | 13.49 | 113.00 |
|
|