|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 2.84 | 5.12 |
| 1987 | 4.44 | 5.23 |
| 1988 | 3.70 | 4.80 |
| 1989 | 2.96 | 4.64 |
| 1990 | 3.91 | 4.81 |
| 1991 | 3.60 | 4.28 |
| 1992 | 4.94 | 5.60 |
| 1993 | 5.02 | 6.29 |
| 1994 | 5.07 | 12.43 |
| 1995 | 2.88 | 6.18 |
| 1996 | 5.95 | 7.58 |
| 1997 | 6.10 | 7.90 |
| 1998 | 7.31 | 9.70 |
| 1999 | 6.94 | 9.35 |
| 2000 | 6.35 | 9.09 |
| 2001 | 6.56 | 9.00 |
| 2002 | 3.65 | 9.23 |
| 2003 | | 9.42 |
| 2004 | | 10.00 |
| 2005 | | 9.34 |
| 2006 | | 10.00 |
| 2007 | | 10.52 |
| 2008 | | 11.12 |
| 2009 | | 11.54 |
| 2010 | | 10.73 |
|
|