|
| year | production | consumption |
| 1980 | 12.71 | 12.71 |
| 1981 | 13.95 | 13.95 |
| 1982 | 18.00 | 18.00 |
| 1983 | 15.50 | 20.00 |
| 1984 | 20.00 | 35.00 |
| 1985 | 14.00 | 42.00 |
| 1986 | 15.00 | 39.00 |
| 1987 | 13.40 | 45.18 |
| 1988 | 12.36 | 39.20 |
| 1989 | 12.72 | 55.45 |
| 1990 | 12.00 | 54.00 |
| 1991 | | 41.00 |
| 1992 | 14.13 | 31.00 |
| 1993 | 13.07 | 52.97 |
| 1994 | 12.36 | 68.86 |
| 1995 | 11.65 | 57.56 |
| 1996 | 27.90 | 66.75 |
| 1997 | 58.62 | 90.76 |
| 1998 | 67.10 | 103.83 |
| 1999 | 67.10 | 105.95 |
| 2000 | 66.39 | 108.77 |
| 2001 | 79.46 | 135.26 |
| 2002 | 75.93 | 135.61 |
| 2003 | 80.87 | 130.31 |
| 2004 | 84.76 | 130.67 |
| 2005 | 88.29 | 151.85 |
| 2006 | 88.29 | 134.20 |
| 2007 | 55.80 | 99.94 |
| 2008 | 48.38 | 110.18 |
| 2009 | 63.92 | 108.06 |
| 2010 | 71.69 | 115.83 |
| 2011 | 68.16 | 131.02 |
|
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