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Loading...
| year | production | consumption |
| 1980 | 4.50 | .42 |
| 1981 | 3.18 | .52 |
| 1982 | 2.86 | .52 |
| 1983 | 2.77 | .52 |
| 1984 | 3.12 | .56 |
| 1985 | 3.36 | .60 |
| 1986 | 3.31 | .59 |
| 1987 | 3.05 | .62 |
| 1988 | 3.30 | .66 |
| 1989 | 3.90 | .72 |
| 1990 | 4.07 | .70 |
| 1991 | 4.30 | .77 |
| 1992 | 4.43 | .79 |
| 1993 | 4.45 | .80 |
| 1994 | 4.37 | .74 |
| 1995 | 4.53 | .83 |
| 1996 | 4.56 | .85 |
| 1997 | 4.85 | .85 |
| 1998 | 4.90 | .82 |
| 1999 | 4.89 | .82 |
| 2000 | 5.18 | .81 |
| 2001 | 5.45 | .91 |
| 2002 | 5.15 | .94 |
| 2003 | 5.71 | .98 |
| 2004 | 5.90 | .98 |
| 2005 | 6.52 | 1.08 |
| 2006 | 6.33 | 1.03 |
| 2007 | 6.28 | .91 |
| 2008 | 5.90 | 1.03 |
| 2009 | 5.71 | .90 |
| 2010 | 6.38 | .81 |
| 2011 | 6.66 | .83 |
| 2012 | 7.05 | 1.14 |
| 2013 | 6.55 | 1.24 |
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