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Loading...
| year | production | consumption |
| 1980 | 51.00 | 21.00 |
| 1981 | 52.00 | 26.00 |
| 1982 | 56.00 | 23.00 |
| 1983 | 52.00 | 32.00 |
| 1984 | 51.00 | 18.00 |
| 1985 | 47.00 | 18.00 |
| 1986 | 47.00 | 15.00 |
| 1987 | 50.00 | 18.00 |
| 1988 | 46.00 | 17.00 |
| 1989 | 42.00 | 17.00 |
| 1990 | 54.00 | 12.00 |
| 1991 | 43.00 | 16.00 |
| 1992 | 41.00 | 12.00 |
| 1993 | 41.00 | 12.00 |
| 1994 | 41.00 | 13.00 |
| 1995 | 34.00 | 6.30 |
| 1996 | 28.00 | 8.50 |
| 1997 | 28.00 | 9.20 |
| 1998 | 27.00 | 7.10 |
| 1999 | 37.00 | 2.80 |
| 2000 | 33.00 | .10 |
| 2001 | 28.00 | 3.00 |
| 2002 | 32.00 | 1.90 |
| 2003 | 37.00 | 2.40 |
| 2004 | 31.00 | 1.80 |
| 2005 | 31.00 | 2.80 |
| 2006 | 17.00 | 2.40 |
| 2007 | 15.00 | 1.50 |
| 2008 | 15.00 | 5.00 |
| 2009 | 12.00 | 6.00 |
| 2010 | 12.00 | 5.90 |
| 2011 | 15.00 | 12.00 |
| 2012 | 13.00 | 5.40 |
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