|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 85.66 | 42.75 |
| 1993 | 45.37 | 22.52 |
| 1994 | 46.66 | 24.06 |
| 1995 | 79.75 | 57.27 |
| 1996 | 43.06 | 6.19 |
| 1997 | 44.12 | 32.73 |
| 1998 | 48.21 | 18.96 |
| 1999 | 61.76 | 24.50 |
| 2000 | 67.70 | 42.84 |
| 2001 | 63.19 | 43.77 |
| 2002 | 59.16 | 40.39 |
| 2003 | 33.57 | 22.67 |
| 2004 | 36.49 | 25.08 |
| 2005 | 35.34 | 26.32 |
| 2006 | 42.87 | 14.94 |
| 2007 | 43.10 | 23.67 |
| 2008 | 51.61 | 18.97 |
| 2009 | 48.40 | 16.15 |
| 2010 | 50.88 | 14.94 |
|
|