|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 1.69 | 10.00 |
| 1993 | 1.60 | 10.91 |
| 1994 | .92 | 12.78 |
| 1995 | 1.31 | 18.62 |
| 1996 | 3.81 | 25.93 |
| 1997 | 4.09 | 27.26 |
| 1998 | 8.10 | 25.70 |
| 1999 | 2.02 | 25.83 |
| 2000 | 1.14 | 24.42 |
| 2001 | .00 | 25.75 |
| 2002 | .00 | 26.37 |
| 2003 | .00 | 26.88 |
| 2004 | | 29.17 |
| 2005 | | 31.15 |
| 2006 | | 31.72 |
| 2007 | | 31.99 |
| 2008 | | 39.16 |
| 2009 | | 33.72 |
| 2010 | | 34.05 |
|
|