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Loading...
| year | production | consumption |
| 1980 | 5.00 | 380.00 |
| 1981 | 3.00 | 340.00 |
| 1982 | 3.00 | 330.00 |
| 1983 | 3.00 | 337.00 |
| 1984 | 3.00 | 384.00 |
| 1985 | 2.00 | 378.00 |
| 1986 | 2.00 | 405.00 |
| 1987 | 3.00 | 420.00 |
| 1988 | 2.00 | 483.00 |
| 1989 | 2.00 | 521.00 |
| 1990 | 3.00 | 542.00 |
| 1991 | 2.20 | 545.00 |
| 1992 | 2.00 | 557.00 |
| 1993 | 1.10 | 616.00 |
| 1994 | 1.30 | 659.00 |
| 1995 | 1.20 | 737.00 |
| 1996 | 1.20 | 780.00 |
| 1997 | 1.00 | 775.00 |
| 1998 | .90 | 808.00 |
| 1999 | .80 | 853.00 |
| 2000 | .70 | 865.00 |
| 2001 | .80 | 882.00 |
| 2002 | .90 | 894.00 |
| 2003 | .90 | 930.00 |
| 2004 | .80 | 948.00 |
| 2005 | .60 | 939.00 |
| 2006 | .40 | 960.00 |
| 2007 | .30 | 1,034.00 |
| 2008 | .30 | 978.00 |
| 2009 | .30 | 971.00 |
| 2010 | .20 | 1,020.00 |
| 2011 | .20 | 944.00 |
| 2012 | .20 | 935.00 |
| 2013 | .20 | 975.00 |
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