|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 35.10 | 47.92 |
| 1993 | 37.39 | 45.48 |
| 1994 | 38.09 | 43.63 |
| 1995 | 38.21 | 42.88 |
| 1996 | 28.01 | 27.17 |
| 1997 | 31.41 | 30.73 |
| 1998 | 32.86 | 32.02 |
| 1999 | 38.28 | 37.42 |
| 2000 | 39.83 | 38.92 |
| 2001 | 43.87 | 42.98 |
| 2002 | 37.46 | 38.56 |
| 2003 | 43.05 | 42.09 |
| 2004 | 40.46 | 39.55 |
| 2005 | 37.39 | 36.81 |
| 2006 | 30.92 | 30.22 |
| 2007 | 33.40 | 32.72 |
| 2008 | 34.49 | 33.74 |
| 2009 | 37.91 | 37.09 |
| 2010 | 33.75 | 33.00 |
|
|