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Loading...
| year | production | consumption |
| 1980 | 3.00 | 306.00 |
| 1981 | 3.00 | 294.00 |
| 1982 | 3.00 | 295.00 |
| 1983 | 3.00 | 295.00 |
| 1984 | 4.00 | 294.00 |
| 1985 | 6.00 | 290.00 |
| 1986 | 6.00 | 286.00 |
| 1987 | 6.00 | 275.00 |
| 1988 | 4.40 | 277.00 |
| 1989 | 5.00 | 235.00 |
| 1990 | 4.00 | 193.00 |
| 1991 | 1.20 | 121.00 |
| 1992 | 1.10 | 130.00 |
| 1993 | 1.00 | 117.00 |
| 1994 | 1.10 | 126.00 |
| 1995 | 1.00 | 131.00 |
| 1996 | .70 | 119.00 |
| 1997 | .60 | 107.00 |
| 1998 | .80 | 103.00 |
| 1999 | .80 | 97.00 |
| 2000 | .90 | 100.00 |
| 2001 | .60 | 101.00 |
| 2002 | .70 | 106.00 |
| 2003 | .60 | 102.00 |
| 2004 | 1.00 | 99.00 |
| 2005 | 1.00 | 104.00 |
| 2006 | 1.00 | 105.00 |
| 2007 | 1.00 | 105.00 |
| 2008 | 1.00 | 104.00 |
| 2009 | 1.00 | 99.00 |
| 2010 | 1.00 | 90.00 |
| 2011 | 1.00 | 84.00 |
| 2012 | 1.00 | 87.00 |
| 2013 | 1.00 | 89.00 |
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