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Loading...
| year | production | consumption |
| 1980 | .00 | 3.00 |
| 1981 | .00 | 3.00 |
| 1982 | .00 | 2.00 |
| 1983 | 4.00 | 3.00 |
| 1984 | 7.00 | 3.00 |
| 1985 | 8.00 | 3.50 |
| 1986 | 8.00 | 3.50 |
| 1987 | 7.00 | 2.70 |
| 1988 | 5.00 | 3.20 |
| 1989 | 4.00 | 3.50 |
| 1990 | 4.00 | 4.10 |
| 1991 | 4.00 | 4.70 |
| 1992 | 5.60 | 5.20 |
| 1993 | 5.80 | 5.80 |
| 1994 | 5.90 | 6.10 |
| 1995 | 3.00 | 6.70 |
| 1996 | 2.00 | 7.20 |
| 1997 | 1.30 | 7.80 |
| 1998 | 1.00 | 8.50 |
| 1999 | 1.00 | 9.20 |
| 2000 | .70 | 11.00 |
| 2001 | .70 | 11.00 |
| 2002 | .80 | 12.00 |
| 2003 | .40 | 14.00 |
| 2004 | .00 | 17.00 |
| 2005 | .00 | 18.00 |
| 2006 | .00 | 21.00 |
| 2007 | .00 | 23.00 |
| 2008 | .00 | 24.00 |
| 2009 | .00 | 31.00 |
| 2010 | .00 | 35.00 |
| 2011 | .00 | 31.00 |
| 2012 | .00 | 31.00 |
| 2013 | .00 | 31.00 |
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