|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 23.07 | 56.45 |
| 1993 | 22.83 | 33.30 |
| 1994 | 23.68 | 32.43 |
| 1995 | 22.00 | 27.02 |
| 1996 | 22.00 | 49.23 |
| 1997 | 19.72 | 67.42 |
| 1998 | 18.00 | 63.44 |
| 1999 | 18.00 | 57.57 |
| 2000 | 16.00 | 62.48 |
| 2001 | 15.00 | 81.94 |
| 2002 | 14.00 | 83.82 |
| 2003 | 13.50 | 84.67 |
| 2004 | 13.00 | 85.08 |
| 2005 | 12.16 | 86.09 |
| 2006 | | |
| 2007 | | |
| 2008 | | |
| 2009 | | |
| 2010 | | |
| 2011 | | |
|
|