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Loading...
| year | production | consumption |
| 1980 | .10 | .10 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | 4.60 | 4.40 |
| 1985 | 7.50 | 2.40 |
| 1986 | 9.00 | .50 |
| 1987 | 5.40 | 5.30 |
| 1988 | 5.40 | 5.70 |
| 1989 | 4.30 | 5.10 |
| 1990 | 4.40 | 5.10 |
| 1991 | 6.20 | 5.80 |
| 1992 | 5.40 | 5.10 |
| 1993 | 6.00 | 5.70 |
| 1994 | 6.00 | 5.50 |
| 1995 | 5.40 | 5.20 |
| 1996 | 6.60 | 5.80 |
| 1997 | 7.00 | 6.60 |
| 1998 | 8.00 | 7.00 |
| 1999 | 7.10 | 6.50 |
| 2000 | 6.10 | 6.30 |
| 2001 | 5.80 | 6.20 |
| 2002 | 6.70 | 6.80 |
| 2003 | 5.60 | 6.30 |
| 2004 | 6.10 | 6.80 |
| 2005 | 6.30 | 6.40 |
| 2006 | 7.10 | 6.80 |
| 2007 | 6.50 | 5.90 |
| 2008 | 7.60 | 6.60 |
| 2009 | 6.50 | 6.00 |
| 2010 | 5.40 | 6.20 |
| 2011 | 5.90 | 5.70 |
| 2012 | 3.70 | 5.50 |
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