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| year | production | consumption |
| 1980 | .47 | 1.08 |
| 1981 | .46 | 1.07 |
| 1982 | .47 | 1.01 |
| 1983 | .46 | 1.02 |
| 1984 | .44 | 1.05 |
| 1985 | .46 | 1.07 |
| 1986 | .46 | 1.07 |
| 1987 | .40 | 1.02 |
| 1988 | .50 | 1.10 |
| 1989 | .50 | 1.11 |
| 1990 | .46 | 1.15 |
| 1991 | .47 | 1.21 |
| 1992 | .50 | 1.19 |
| 1993 | .51 | 1.23 |
| 1994 | .49 | 1.22 |
| 1995 | .52 | 1.27 |
| 1996 | .49 | 1.32 |
| 1997 | .49 | 1.34 |
| 1998 | .51 | 1.36 |
| 1999 | .55 | 1.37 |
| 2000 | .56 | 1.35 |
| 2001 | .55 | 1.41 |
| 2002 | .55 | 1.42 |
| 2003 | .49 | 1.43 |
| 2004 | .52 | 1.48 |
| 2005 | .51 | 1.53 |
| 2006 | .52 | 1.52 |
| 2007 | .54 | 1.50 |
| 2008 | .54 | 1.50 |
| 2009 | .56 | 1.44 |
| 2010 | .54 | 1.49 |
| 2011 | .51 | 1.40 |
| 2012 | .60 | 1.44 |
| 2013 | .57 | 1.46 |
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