|
| year | production | consumption |
| 1980 | 194.01 | 194.01 |
| 1981 | 180.78 | 180.78 |
| 1982 | 180.78 | 180.78 |
| 1983 | 112.44 | 112.44 |
| 1984 | 137.79 | 137.79 |
| 1985 | 182.98 | 182.98 |
| 1986 | 189.60 | 189.60 |
| 1987 | 181.88 | 181.88 |
| 1988 | 181.88 | 181.88 |
| 1989 | 181.88 | 181.88 |
| 1990 | 176.37 | 176.37 |
| 1991 | 135.72 | 135.72 |
| 1992 | 110.78 | 110.78 |
| 1993 | 54.84 | 54.84 |
| 1994 | 200.90 | 200.90 |
| 1995 | 188.77 | 188.77 |
| 1996 | 142.61 | 142.61 |
| 1997 | 376.09 | 234.42 |
| 1998 | 376.09 | 234.42 |
| 1999 | 487.03 | 242.99 |
| 2000 | 383.88 | 221.59 |
| 2001 | 496.04 | 225.65 |
| 2002 | 561.96 | 203.09 |
| 2003 | 452.51 | 180.52 |
| 2004 | 488.71 | 175.41 |
| 2005 | 497.07 | 116.75 |
| 2006 | 488.91 | 170.42 |
| 2007 | 508.96 | 177.40 |
| 2008 | 524.20 | 182.21 |
| 2009 | 530.69 | 141.59 |
| 2010 | 530.69 | 146.05 |
| 2011 | 530.69 | 146.05 |
|
|
