|
| year | production | consumption |
| 1980 | 30.00 | 23.00 |
| 1981 | 27.00 | 23.00 |
| 1982 | 30.00 | 24.00 |
| 1983 | 30.00 | 23.00 |
| 1984 | 32.00 | 24.00 |
| 1985 | 30.00 | 22.00 |
| 1986 | 24.00 | 17.28 |
| 1987 | 17.00 | 16.39 |
| 1988 | 13.00 | 16.66 |
| 1989 | 15.00 | 16.65 |
| 1990 | 13.00 | 15.24 |
| 1991 | 15.00 | 15.66 |
| 1992 | 14.40 | 16.44 |
| 1993 | 13.60 | 16.53 |
| 1994 | 13.60 | 18.92 |
| 1995 | 9.56 | 18.36 |
| 1996 | 8.01 | 19.75 |
| 1997 | | 25.35 |
| 1998 | 11.00 | 29.95 |
| 1999 | 9.50 | 36.48 |
| 2000 | 12.00 | 36.75 |
| 2001 | 10.00 | 33.65 |
| 2002 | 15.00 | 34.52 |
| 2003 | 15.00 | 35.97 |
| 2004 | 20.00 | 40.29 |
| 2005 | 20.00 | 42.99 |
| 2006 | 23.00 | 40.01 |
| 2007 | 21.16 | 39.77 |
| 2008 | 21.35 | 29.16 |
| 2009 | 18.08 | 26.51 |
| 2010 | 20.33 | 26.69 |
| 2011 | 20.00 | 45.00 |
|
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