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Loading...
| year | production | consumption |
| 1980 | .10 | .54 |
| 1981 | .08 | .53 |
| 1982 | .10 | .53 |
| 1983 | .12 | .52 |
| 1984 | .15 | .49 |
| 1985 | .15 | .48 |
| 1986 | .15 | .49 |
| 1987 | .14 | .55 |
| 1988 | .16 | .59 |
| 1989 | .16 | .66 |
| 1990 | .16 | .67 |
| 1991 | .15 | .68 |
| 1992 | .16 | .71 |
| 1993 | .16 | .79 |
| 1994 | .17 | .84 |
| 1995 | .16 | .90 |
| 1996 | .17 | .95 |
| 1997 | .16 | 1.01 |
| 1998 | .17 | 1.06 |
| 1999 | .21 | 1.12 |
| 2000 | .23 | 1.14 |
| 2001 | .23 | 1.11 |
| 2002 | .30 | 1.14 |
| 2003 | .36 | 1.17 |
| 2004 | .40 | 1.22 |
| 2005 | .41 | 1.17 |
| 2006 | .39 | 1.11 |
| 2007 | .42 | 1.15 |
| 2008 | .44 | 1.19 |
| 2009 | .47 | 1.21 |
| 2010 | .50 | 1.21 |
| 2011 | .51 | 1.21 |
| 2012 | .52 | 1.29 |
| 2013 | .49 | 1.33 |
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