|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 2.25 | 7.05 |
| 1987 | 2.11 | 9.67 |
| 1988 | 3.49 | 12.35 |
| 1989 | 4.58 | 10.15 |
| 1990 | 3.42 | 9.76 |
| 1991 | .86 | 6.17 |
| 1992 | 1.49 | 6.83 |
| 1993 | 1.43 | 6.85 |
| 1994 | 1.47 | 6.93 |
| 1995 | 1.64 | 5.94 |
| 1996 | 1.63 | 5.95 |
| 1997 | 1.33 | 6.89 |
| 1998 | 1.25 | 6.48 |
| 1999 | .39 | 6.89 |
| 2000 | .39 | 4.93 |
| 2001 | .39 | 2.82 |
| 2002 | | 2.43 |
| 2003 | | 2.45 |
| 2004 | | 5.16 |
| 2005 | | 5.13 |
| 2006 | | 5.13 |
| 2007 | | 5.11 |
| 2008 | | 5.87 |
| 2009 | | 4.60 |
| 2010 | | 4.84 |
|
|
