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Loading...
| year | production | consumption |
| 1980 | .54 | .40 |
| 1981 | .56 | .43 |
| 1982 | .56 | .43 |
| 1983 | .50 | .40 |
| 1984 | .54 | .41 |
| 1985 | .56 | .41 |
| 1986 | .54 | .45 |
| 1987 | .51 | .45 |
| 1988 | .46 | .45 |
| 1989 | .43 | .41 |
| 1990 | .41 | .38 |
| 1991 | .39 | .38 |
| 1992 | .37 | .37 |
| 1993 | .43 | .43 |
| 1994 | .44 | .45 |
| 1995 | .44 | .47 |
| 1996 | .43 | .50 |
| 1997 | .40 | .48 |
| 1998 | .40 | .50 |
| 1999 | .39 | .51 |
| 2000 | .39 | .52 |
| 2001 | .40 | .53 |
| 2002 | .40 | .54 |
| 2003 | .40 | .55 |
| 2004 | .41 | .58 |
| 2005 | .47 | .61 |
| 2006 | .51 | .67 |
| 2007 | .54 | .68 |
| 2008 | .59 | .77 |
| 2009 | .62 | .75 |
| 2010 | .81 | .88 |
| 2011 | .99 | .91 |
| 2012 | 1.01 | .97 |
| 2013 | 1.05 | .86 |
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