|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 18.01 | 13.30 |
| 1993 | 24.26 | 11.61 |
| 1994 | 25.24 | 15.00 |
| 1995 | 29.02 | 16.17 |
| 1996 | 24.63 | 14.82 |
| 1997 | 25.45 | 18.33 |
| 1998 | 27.06 | 17.22 |
| 1999 | 28.25 | 18.28 |
| 2000 | 34.63 | 18.27 |
| 2001 | 28.28 | 17.62 |
| 2002 | 28.25 | 19.09 |
| 2003 | 29.47 | 17.67 |
| 2004 | 28.57 | 16.85 |
| 2005 | 28.65 | 16.90 |
| 2006 | 25.31 | 16.59 |
| 2007 | 28.09 | 16.92 |
| 2008 | 23.39 | 16.24 |
| 2009 | 28.21 | 16.15 |
| 2010 | 25.57 | 15.19 |
|
|