|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 13.02 | 13.02 |
| 1993 | 10.45 | 13.40 |
| 1994 | 16.18 | 16.18 |
| 1995 | 9.84 | 9.84 |
| 1996 | 12.92 | 12.92 |
| 1997 | 6.26 | 5.94 |
| 1998 | 2.02 | 1.70 |
| 1999 | 5.03 | 4.72 |
| 2000 | 1.95 | 2.78 |
| 2001 | 1.49 | 3.20 |
| 2002 | 3.22 | 3.67 |
| 2003 | 4.90 | 8.87 |
| 2004 | 5.96 | 5.48 |
| 2005 | 6.57 | 5.52 |
| 2006 | 6.43 | 4.94 |
| 2007 | 5.94 | 4.54 |
| 2008 | 6.45 | 3.02 |
| 2009 | 6.30 | 2.93 |
| 2010 | 6.98 | 2.15 |
|
|
