|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | .91 | 1.04 |
| 1987 | .81 | .87 |
| 1988 | .78 | 1.56 |
| 1989 | .74 | 1.29 |
| 1990 | .83 | .89 |
| 1991 | .89 | 1.58 |
| 1992 | .85 | 1.64 |
| 1993 | .81 | 1.97 |
| 1994 | 1.30 | 2.60 |
| 1995 | .60 | 2.20 |
| 1996 | .47 | 3.52 |
| 1997 | .48 | 3.47 |
| 1998 | .60 | 3.74 |
| 1999 | .60 | 4.13 |
| 2000 | .47 | 4.50 |
| 2001 | .51 | 4.69 |
| 2002 | .47 | 4.03 |
| 2003 | .38 | 5.59 |
| 2004 | .48 | 5.19 |
| 2005 | .47 | 5.43 |
| 2006 | .57 | 6.67 |
| 2007 | .64 | 6.86 |
| 2008 | .44 | 6.96 |
| 2009 | .44 | 7.36 |
| 2010 | .44 | 7.81 |
|
|
