|
| year | production | consumption |
| 1980 | | 259.04 |
| 1981 | | 271.17 |
| 1982 | | 329.59 |
| 1983 | | 176.37 |
| 1984 | | 68.34 |
| 1985 | | 108.03 |
| 1986 | | 163.14 |
| 1987 | | 256.84 |
| 1988 | | 222.67 |
| 1989 | | 275.58 |
| 1990 | | 620.60 |
| 1991 | | 198.42 |
| 1992 | | 186.29 |
| 1993 | | 69.45 |
| 1994 | | 65.04 |
| 1995 | | 707.68 |
| 1996 | | 388.01 |
| 1997 | | 712.09 |
| 1998 | | 205.03 |
| 1999 | | 101.41 |
| 2000 | | 727.53 |
| 2001 | | 771.62 |
| 2002 | | 771.62 |
| 2003 | | 771.62 |
| 2004 | | 771.62 |
| 2005 | 84.88 | 817.92 |
| 2006 | 497.14 | 1,042.79 |
| 2007 | 397.93 | 988.77 |
| 2008 | 925.94 | 1,385.61 |
| 2009 | 978.85 | 1,385.61 |
| 2010 | 848.78 | 1,385.61 |
| 2011 | 1,102.31 | 2,037.07 |
|
|