|
| year | production | consumption |
| 1980 | | 200.00 |
| 1981 | | 219.00 |
| 1982 | | 158.80 |
| 1983 | | 152.00 |
| 1984 | | 167.00 |
| 1985 | | 144.58 |
| 1986 | | 155.52 |
| 1987 | | 161.79 |
| 1988 | | 147.46 |
| 1989 | | 143.07 |
| 1990 | | 140.16 |
| 1991 | | 175.61 |
| 1992 | | 155.58 |
| 1993 | | 162.16 |
| 1994 | | 165.37 |
| 1995 | | 169.07 |
| 1996 | | 174.87 |
| 1997 | | 179.25 |
| 1998 | | 183.54 |
| 1999 | | 153.62 |
| 2000 | | 201.35 |
| 2001 | | 213.86 |
| 2002 | | 212.08 |
| 2003 | | 217.81 |
| 2004 | | 222.76 |
| 2005 | | 215.21 |
| 2006 | | 210.73 |
| 2007 | | 169.65 |
| 2008 | | 175.24 |
| 2009 | | 155.62 |
| 2010 | | 176.00 |
| 2011 | | 152.00 |
|
|