|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 3.87 | 3.87 |
| 1987 | 8.91 | 8.84 |
| 1988 | 2.52 | 8.02 |
| 1989 | 3.25 | 12.47 |
| 1990 | 5.60 | 16.48 |
| 1991 | 5.23 | 17.50 |
| 1992 | 7.84 | 21.86 |
| 1993 | 11.76 | 19.77 |
| 1994 | 7.98 | 13.54 |
| 1995 | 10.71 | 20.24 |
| 1996 | 11.55 | 20.27 |
| 1997 | 13.08 | 75.47 |
| 1998 | 13.65 | 38.51 |
| 1999 | 18.54 | 44.98 |
| 2000 | 25.02 | 40.27 |
| 2001 | 26.27 | 37.82 |
| 2002 | 26.89 | 45.71 |
| 2003 | 27.89 | 42.61 |
| 2004 | 36.32 | 45.38 |
| 2005 | 41.18 | 49.47 |
| 2006 | 80.27 | 57.23 |
| 2007 | 35.85 | 44.59 |
| 2008 | 35.28 | 38.20 |
| 2009 | 22.09 | 64.40 |
| 2010 | 100.77 | 72.77 |
|
|
