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Loading...
| year | production | consumption |
| 1980 | .28 | .44 |
| 1981 | .30 | .42 |
| 1982 | .27 | .36 |
| 1983 | .27 | .39 |
| 1984 | .28 | .40 |
| 1985 | .28 | .40 |
| 1986 | .27 | .41 |
| 1987 | .28 | .42 |
| 1988 | .28 | .47 |
| 1989 | .28 | .52 |
| 1990 | .32 | .59 |
| 1991 | .31 | .59 |
| 1992 | .34 | .65 |
| 1993 | .34 | .69 |
| 1994 | .34 | .74 |
| 1995 | .36 | .81 |
| 1996 | .34 | .87 |
| 1997 | .34 | .98 |
| 1998 | .30 | .97 |
| 1999 | .23 | 1.01 |
| 2000 | .28 | 1.02 |
| 2001 | .32 | 1.05 |
| 2002 | .32 | 1.07 |
| 2003 | .34 | 1.14 |
| 2004 | .31 | 1.22 |
| 2005 | .39 | 1.28 |
| 2006 | .40 | 1.31 |
| 2007 | .34 | 1.30 |
| 2008 | .36 | 1.36 |
| 2009 | .39 | 1.36 |
| 2010 | .34 | 1.32 |
| 2011 | .35 | 1.37 |
| 2012 | .33 | 1.36 |
| 2013 | .35 | 1.35 |
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