|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | 8.94 |
| 1987 | | 9.94 |
| 1988 | .00 | 11.92 |
| 1989 | .01 | 13.94 |
| 1990 | .19 | 12.50 |
| 1991 | .19 | 10.78 |
| 1992 | .19 | 11.11 |
| 1993 | .19 | 14.33 |
| 1994 | .19 | 15.89 |
| 1995 | .19 | 17.53 |
| 1996 | .19 | 19.70 |
| 1997 | .20 | 19.49 |
| 1998 | .21 | 25.92 |
| 1999 | | 25.60 |
| 2000 | | 28.59 |
| 2001 | .01 | 28.57 |
| 2002 | | 44.45 |
| 2003 | | 40.93 |
| 2004 | | 38.58 |
| 2005 | | 40.12 |
| 2006 | | 36.86 |
| 2007 | | 35.89 |
| 2008 | | 31.31 |
| 2009 | 1.11 | 27.64 |
| 2010 | 4.32 | 39.41 |
|
|