|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 5.38 | 12.95 |
| 1987 | 2.97 | 13.35 |
| 1988 | 5.54 | 16.06 |
| 1989 | 3.91 | 14.60 |
| 1990 | 3.76 | 13.00 |
| 1991 | 6.54 | 18.68 |
| 1992 | 6.63 | 15.21 |
| 1993 | 6.67 | 12.39 |
| 1994 | 3.75 | 13.52 |
| 1995 | 6.69 | 7.34 |
| 1996 | 6.69 | 7.36 |
| 1997 | 6.75 | 7.42 |
| 1998 | 6.77 | 7.46 |
| 1999 | 3.87 | 11.26 |
| 2000 | 17.03 | 21.74 |
| 2001 | 19.74 | 23.80 |
| 2002 | 20.92 | 29.77 |
| 2003 | 26.03 | 32.86 |
| 2004 | 28.55 | 33.26 |
| 2005 | 30.74 | 33.70 |
| 2006 | 37.87 | 38.53 |
| 2007 | 38.28 | 41.90 |
| 2008 | 33.29 | 45.52 |
| 2009 | 48.23 | 65.48 |
| 2010 | 48.42 | 57.78 |
|
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