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Loading...
| year | production | consumption |
| 1980 | .95 | .08 |
| 1981 | .81 | .09 |
| 1982 | .76 | .09 |
| 1983 | .79 | .07 |
| 1984 | .74 | .06 |
| 1985 | .71 | .08 |
| 1986 | .74 | .05 |
| 1987 | .69 | .08 |
| 1988 | .68 | .07 |
| 1989 | .67 | .08 |
| 1990 | .72 | .08 |
| 1991 | .68 | .04 |
| 1992 | .71 | .06 |
| 1993 | .71 | .05 |
| 1994 | .72 | .05 |
| 1995 | .75 | .06 |
| 1996 | .73 | .06 |
| 1997 | .74 | .06 |
| 1998 | .70 | .06 |
| 1999 | .78 | .06 |
| 2000 | .82 | .07 |
| 2001 | .84 | .07 |
| 2002 | .79 | .09 |
| 2003 | .83 | .09 |
| 2004 | .85 | .10 |
| 2005 | .89 | .12 |
| 2006 | .98 | .18 |
| 2007 | .88 | .19 |
| 2008 | .84 | .19 |
| 2009 | .74 | .13 |
| 2010 | .78 | .15 |
| 2011 | .83 | .15 |
| 2012 | .77 | .15 |
| 2013 | .74 | .15 |
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