|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 28.91 | 38.81 |
| 1993 | 31.53 | 40.55 |
| 1994 | 26.22 | 45.33 |
| 1995 | 17.93 | 41.04 |
| 1996 | 18.29 | 30.36 |
| 1997 | 26.57 | 26.16 |
| 1998 | 27.43 | 30.17 |
| 1999 | 17.05 | 18.06 |
| 2000 | 18.59 | 16.13 |
| 2001 | 30.06 | 24.04 |
| 2002 | 24.24 | 12.85 |
| 2003 | 27.15 | 11.00 |
| 2004 | 32.82 | 10.75 |
| 2005 | 35.37 | 13.27 |
| 2006 | 38.98 | 9.79 |
| 2007 | 25.27 | 11.93 |
| 2008 | 35.67 | 7.88 |
| 2009 | 32.65 | 10.90 |
| 2010 | 34.27 | 9.86 |
|
|