|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 4.30 | 4.30 |
| 1987 | 5.62 | 5.62 |
| 1988 | 5.00 | 5.00 |
| 1989 | 4.70 | 6.30 |
| 1990 | 3.62 | 5.15 |
| 1991 | 4.30 | 5.87 |
| 1992 | 4.33 | 5.92 |
| 1993 | 4.99 | 6.59 |
| 1994 | 4.40 | 6.01 |
| 1995 | 4.40 | 6.20 |
| 1996 | 7.34 | 7.11 |
| 1997 | 6.44 | 8.24 |
| 1998 | 5.56 | 7.40 |
| 1999 | 5.77 | 13.27 |
| 2000 | 7.32 | 14.70 |
| 2001 | 7.22 | 14.43 |
| 2002 | 9.14 | 15.19 |
| 2003 | 10.08 | 15.27 |
| 2004 | 12.75 | 18.29 |
| 2005 | 10.63 | 18.67 |
| 2006 | 6.01 | 20.61 |
| 2007 | 8.13 | 23.54 |
| 2008 | 7.38 | 17.41 |
| 2009 | 2.25 | 15.02 |
| 2010 | 5.99 | 19.56 |
|
|
