|
| year | production | consumption |
| 1980 | 58.00 | 16.00 |
| 1981 | 87.00 | 16.00 |
| 1982 | 109.00 | 19.00 |
| 1983 | 114.00 | 19.00 |
| 1984 | 135.00 | 19.00 |
| 1985 | 185.00 | 19.50 |
| 1986 | 177.00 | 22.12 |
| 1987 | 174.00 | 20.84 |
| 1988 | 163.00 | 19.95 |
| 1989 | 170.00 | 24.21 |
| 1990 | 161.00 | 24.49 |
| 1991 | 153.29 | 24.68 |
| 1992 | 140.36 | 24.77 |
| 1993 | 126.86 | 20.52 |
| 1994 | 107.95 | 22.75 |
| 1995 | 111.00 | 23.35 |
| 1996 | 108.00 | 22.53 |
| 1997 | 124.00 | 23.50 |
| 1998 | 120.50 | 23.41 |
| 1999 | 100.00 | 21.58 |
| 2000 | 84.82 | 22.73 |
| 2001 | 76.65 | 22.54 |
| 2002 | 69.82 | 22.45 |
| 2003 | 67.00 | 23.50 |
| 2004 | 65.99 | 23.52 |
| 2005 | 82.32 | 23.80 |
| 2006 | 86.40 | 26.13 |
| 2007 | 82.83 | 29.35 |
| 2008 | 81.33 | 30.70 |
| 2009 | 76.90 | 33.43 |
| 2010 | 65.00 | 36.48 |
| 2011 | 61.66 | 27.00 |
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