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Loading...
| year | production | consumption |
| 1980 | .24 | 1.12 |
| 1981 | .29 | 1.07 |
| 1982 | .31 | 1.08 |
| 1983 | .36 | 1.23 |
| 1984 | .41 | 1.42 |
| 1985 | .46 | 1.46 |
| 1986 | .42 | 1.56 |
| 1987 | .48 | 1.67 |
| 1988 | .41 | 1.80 |
| 1989 | .41 | 1.91 |
| 1990 | .50 | 2.03 |
| 1991 | .43 | 2.09 |
| 1992 | .44 | 2.19 |
| 1993 | .41 | 2.42 |
| 1994 | .43 | 2.58 |
| 1995 | .44 | 2.84 |
| 1996 | .46 | 3.05 |
| 1997 | .44 | 3.19 |
| 1998 | .46 | 3.41 |
| 1999 | .46 | 3.56 |
| 2000 | .47 | 3.83 |
| 2001 | .44 | 3.90 |
| 2002 | .47 | 4.11 |
| 2003 | .46 | 4.26 |
| 2004 | .47 | 4.40 |
| 2005 | .48 | 4.43 |
| 2006 | .47 | 4.55 |
| 2007 | .48 | 4.82 |
| 2008 | .47 | 4.64 |
| 2009 | .47 | 4.56 |
| 2010 | .48 | 4.91 |
| 2011 | .48 | 4.73 |
| 2012 | .48 | 4.63 |
| 2013 | .49 | 4.71 |
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