|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 12.99 | 16.01 |
| 1987 | 9.74 | 18.99 |
| 1988 | 7.77 | 15.39 |
| 1989 | 7.98 | 7.60 |
| 1990 | 4.70 | 7.20 |
| 1991 | 3.17 | 20.08 |
| 1992 | 2.95 | 15.76 |
| 1993 | 2.56 | 22.71 |
| 1994 | | 24.63 |
| 1995 | | 21.18 |
| 1996 | | 26.79 |
| 1997 | | 31.58 |
| 1998 | | 28.98 |
| 1999 | | 27.83 |
| 2000 | | 27.42 |
| 2001 | | 31.86 |
| 2002 | | 29.16 |
| 2003 | | 26.59 |
| 2004 | | 25.17 |
| 2005 | | 21.66 |
| 2006 | | 18.98 |
| 2007 | | 19.89 |
| 2008 | | 22.55 |
| 2009 | | 25.95 |
| 2010 | | 24.74 |
|
|