|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 2.39 | 8.56 |
| 1993 | 3.23 | 18.43 |
| 1994 | 1.73 | 17.78 |
| 1995 | 2.80 | 19.07 |
| 1996 | 1.84 | 18.40 |
| 1997 | 2.08 | 22.01 |
| 1998 | .33 | 18.65 |
| 1999 | .98 | 18.23 |
| 2000 | .82 | 18.60 |
| 2001 | | 18.67 |
| 2002 | | 17.76 |
| 2003 | | 17.50 |
| 2004 | | 15.52 |
| 2005 | | 15.87 |
| 2006 | | 14.96 |
| 2007 | | 14.49 |
| 2008 | | 15.03 |
| 2009 | | 13.81 |
| 2010 | | 13.23 |
|
|