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Loading...
| year | production | consumption |
| 1980 | .17 | .94 |
| 1981 | .29 | .88 |
| 1982 | .30 | .87 |
| 1983 | .32 | .88 |
| 1984 | .32 | .92 |
| 1985 | .31 | .93 |
| 1986 | .32 | .96 |
| 1987 | .33 | 1.04 |
| 1988 | .33 | 1.04 |
| 1989 | .32 | 1.05 |
| 1990 | .36 | 1.10 |
| 1991 | .38 | 1.12 |
| 1992 | .39 | 1.12 |
| 1993 | .39 | 1.13 |
| 1994 | .38 | 1.18 |
| 1995 | .39 | 1.12 |
| 1996 | .37 | 1.13 |
| 1997 | .40 | 1.17 |
| 1998 | .46 | 1.21 |
| 1999 | .44 | 1.20 |
| 2000 | .46 | 1.23 |
| 2001 | .44 | 1.24 |
| 2002 | .42 | 1.25 |
| 2003 | .42 | 1.30 |
| 2004 | .48 | 1.34 |
| 2005 | .46 | 1.26 |
| 2006 | .45 | 1.31 |
| 2007 | .47 | 1.33 |
| 2008 | .50 | 1.29 |
| 2009 | .44 | 1.20 |
| 2010 | .46 | 1.29 |
| 2011 | .46 | 1.22 |
| 2012 | .50 | 1.21 |
| 2013 | .48 | 1.20 |
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