|
| year | production | consumption |
| 1980 | | 24.00 |
| 1981 | | 26.40 |
| 1982 | | 26.00 |
| 1983 | | 26.60 |
| 1984 | | 27.00 |
| 1985 | | 27.88 |
| 1986 | .80 | 28.62 |
| 1987 | | 34.63 |
| 1988 | 15.00 | 40.12 |
| 1989 | 32.00 | 46.40 |
| 1990 | 50.00 | 53.00 |
| 1991 | 80.00 | 55.75 |
| 1992 | 106.23 | 60.98 |
| 1993 | 120.00 | 77.37 |
| 1994 | 140.51 | 84.98 |
| 1995 | 173.30 | 94.31 |
| 1996 | 175.45 | 115.76 |
| 1997 | 191.26 | 128.77 |
| 1998 | 245.75 | 135.45 |
| 1999 | 289.80 | 158.84 |
| 2000 | 316.00 | 175.71 |
| 2001 | 356.75 | 178.57 |
| 2002 | 339.59 | 192.90 |
| 2003 | 352.51 | 214.62 |
| 2004 | 403.29 | 238.37 |
| 2005 | 374.33 | 244.59 |
| 2006 | 345.44 | 250.73 |
| 2007 | 318.94 | 277.22 |
| 2008 | 299.65 | 292.78 |
| 2009 | 328.40 | 293.99 |
| 2010 | 318.18 | 320.36 |
| 2011 | 309.12 | 352.00 |
|
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