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Loading...
| year | production | consumption |
| 1980 | 1.40 | 371.00 |
| 1981 | 1.10 | 341.00 |
| 1982 | 1.10 | 282.00 |
| 1983 | .60 | 297.00 |
| 1984 | 1.30 | 306.00 |
| 1985 | 1.40 | 306.00 |
| 1986 | .90 | 272.00 |
| 1987 | 1.00 | 304.00 |
| 1988 | .60 | 299.00 |
| 1989 | .50 | 332.00 |
| 1990 | .40 | 341.00 |
| 1991 | .30 | 363.00 |
| 1992 | .20 | 374.00 |
| 1993 | .10 | 392.00 |
| 1994 | .04 | 401.00 |
| 1995 | .00 | 443.00 |
| 1996 | .07 | 493.00 |
| 1997 | .00 | 470.00 |
| 1998 | .00 | 518.00 |
| 1999 | .00 | 551.00 |
| 2000 | .07 | 554.00 |
| 2001 | .00 | 547.00 |
| 2002 | .00 | 564.00 |
| 2003 | .00 | 600.00 |
| 2004 | .00 | 612.00 |
| 2005 | .00 | 601.00 |
| 2006 | .00 | 619.00 |
| 2007 | .00 | 624.00 |
| 2008 | .00 | 619.00 |
| 2009 | .00 | 625.00 |
| 2010 | .00 | 700.00 |
| 2011 | .00 | 626.00 |
| 2012 | .00 | 631.00 |
| 2013 | .00 | 635.00 |
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