|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 32.77 | 49.91 |
| 1993 | 36.70 | 45.92 |
| 1994 | 35.58 | 36.94 |
| 1995 | 37.73 | 40.29 |
| 1996 | 41.51 | 40.36 |
| 1997 | 37.96 | 37.89 |
| 1998 | 34.74 | 34.65 |
| 1999 | 33.79 | 33.79 |
| 2000 | 32.78 | 32.78 |
| 2001 | 30.11 | 25.55 |
| 2002 | 32.47 | 33.66 |
| 2003 | 37.14 | 37.14 |
| 2004 | 34.93 | 34.93 |
| 2005 | 29.03 | 33.30 |
| 2006 | 29.70 | 29.70 |
| 2007 | 28.59 | 28.59 |
| 2008 | 9.60 | 9.60 |
| 2009 | 10.30 | 10.30 |
| 2010 | 10.44 | 10.44 |
|
|