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Loading...
| year | production | consumption |
| 1980 | .38 | .03 |
| 1981 | .33 | .03 |
| 1982 | .34 | .03 |
| 1983 | .35 | .04 |
| 1984 | .35 | .04 |
| 1985 | .38 | .03 |
| 1986 | .37 | .03 |
| 1987 | .34 | .03 |
| 1988 | .35 | .04 |
| 1989 | .46 | .04 |
| 1990 | .59 | .04 |
| 1991 | .64 | .04 |
| 1992 | .65 | .05 |
| 1993 | .68 | .04 |
| 1994 | .72 | .04 |
| 1995 | .80 | .04 |
| 1996 | .81 | .04 |
| 1997 | .81 | .05 |
| 1998 | .77 | .04 |
| 1999 | .72 | .04 |
| 2000 | .69 | .04 |
| 2001 | .59 | .04 |
| 2002 | .55 | .04 |
| 2003 | .53 | .04 |
| 2004 | .53 | .04 |
| 2005 | .58 | .04 |
| 2006 | .52 | .04 |
| 2007 | .54 | .05 |
| 2008 | .55 | .05 |
| 2009 | .53 | .05 |
| 2010 | .54 | .05 |
| 2011 | .54 | .05 |
| 2012 | .49 | .06 |
| 2013 | .54 | .07 |
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