|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 10.64 | 10.64 |
| 1987 | 11.83 | 11.53 |
| 1988 | 12.52 | 11.76 |
| 1989 | 13.66 | 13.69 |
| 1990 | 14.73 | 13.69 |
| 1991 | 14.27 | 14.27 |
| 1992 | 12.66 | 16.17 |
| 1993 | 13.36 | 16.57 |
| 1994 | 17.35 | 17.62 |
| 1995 | 27.49 | 13.78 |
| 1996 | 16.46 | 20.69 |
| 1997 | 22.02 | 21.89 |
| 1998 | 18.26 | 17.34 |
| 1999 | 21.93 | 20.95 |
| 2000 | 22.85 | 24.63 |
| 2001 | 25.39 | 23.80 |
| 2002 | 22.61 | 24.19 |
| 2003 | 24.56 | 21.03 |
| 2004 | 19.93 | 19.04 |
| 2005 | 20.47 | 20.66 |
| 2006 | 20.97 | 21.83 |
| 2007 | 21.42 | 22.06 |
| 2008 | 21.42 | 22.06 |
| 2009 | 20.54 | 21.20 |
| 2010 | 18.22 | 18.92 |
|
|
