|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | 6.54 |
| 1987 | | 6.54 |
| 1988 | | 10.53 |
| 1989 | | 11.47 |
| 1990 | .16 | 16.43 |
| 1991 | .16 | 14.19 |
| 1992 | .16 | 15.78 |
| 1993 | .16 | 20.33 |
| 1994 | .16 | 22.25 |
| 1995 | .16 | 23.53 |
| 1996 | .16 | 25.57 |
| 1997 | .16 | 34.49 |
| 1998 | .20 | 27.48 |
| 1999 | | 32.18 |
| 2000 | | 34.00 |
| 2001 | | 37.20 |
| 2002 | | 47.74 |
| 2003 | | 49.68 |
| 2004 | | 60.69 |
| 2005 | | 61.49 |
| 2006 | | 60.29 |
| 2007 | | 73.17 |
| 2008 | | 80.73 |
| 2009 | 15.75 | 94.53 |
| 2010 | 54.43 | 100.51 |
|
|