|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 4.93 | 5.34 |
| 1987 | 6.11 | 5.07 |
| 1988 | 4.95 | 5.38 |
| 1989 | 4.72 | 3.01 |
| 1990 | 4.91 | 3.17 |
| 1991 | 5.47 | 7.29 |
| 1992 | 5.73 | 7.84 |
| 1993 | 5.77 | 5.14 |
| 1994 | 5.82 | 5.82 |
| 1995 | 5.84 | 5.84 |
| 1996 | 6.68 | 6.68 |
| 1997 | 1.69 | 5.38 |
| 1998 | 1.45 | 4.99 |
| 1999 | 1.14 | 6.42 |
| 2000 | 1.52 | 5.72 |
| 2001 | 1.50 | 6.99 |
| 2002 | 1.25 | 7.13 |
| 2003 | 1.24 | 7.43 |
| 2004 | 1.32 | 7.83 |
| 2005 | 1.49 | 8.05 |
| 2006 | 1.38 | 8.77 |
| 2007 | .89 | 8.76 |
| 2008 | .77 | 8.96 |
| 2009 | .99 | 9.66 |
| 2010 | .91 | 10.12 |
|
|
