|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 5.85 | 8.69 |
| 1987 | 5.12 | 7.97 |
| 1988 | 4.58 | 9.59 |
| 1989 | 5.11 | 8.45 |
| 1990 | 4.85 | 10.32 |
| 1991 | 4.78 | 8.88 |
| 1992 | 5.48 | 9.16 |
| 1993 | 6.46 | 9.92 |
| 1994 | 5.73 | 9.86 |
| 1995 | 4.74 | 8.56 |
| 1996 | 4.68 | 12.12 |
| 1997 | 5.05 | 10.51 |
| 1998 | 4.87 | 11.19 |
| 1999 | 9.43 | 14.71 |
| 2000 | 9.41 | 15.05 |
| 2001 | 9.89 | 17.20 |
| 2002 | 9.68 | 16.83 |
| 2003 | 9.42 | 16.31 |
| 2004 | 9.42 | 16.29 |
| 2005 | 10.77 | 17.25 |
| 2006 | 10.52 | 20.31 |
| 2007 | 4.20 | 16.37 |
| 2008 | 4.20 | 26.66 |
| 2009 | 3.94 | 27.01 |
| 2010 | 14.80 | 27.83 |
|
|
