|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 61.48 | 55.67 |
| 1993 | 83.83 | 82.92 |
| 1994 | 78.46 | 77.40 |
| 1995 | 81.14 | 65.37 |
| 1996 | 75.02 | 74.40 |
| 1997 | 72.67 | 58.66 |
| 1998 | 75.74 | 77.77 |
| 1999 | 73.44 | 76.33 |
| 2000 | 48.31 | 43.22 |
| 2001 | 46.01 | 41.08 |
| 2002 | 45.12 | 41.67 |
| 2003 | 46.91 | 44.11 |
| 2004 | 40.74 | 41.39 |
| 2005 | 46.86 | 35.42 |
| 2006 | 58.40 | 44.46 |
| 2007 | 47.24 | 29.29 |
| 2008 | 28.92 | 12.57 |
| 2009 | 6.66 | 6.28 |
| 2010 | 5.91 | 3.15 |
|
|