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Loading...
| year | production | consumption |
| 1980 | .01 | .03 |
| 1981 | .01 | .03 |
| 1982 | .01 | .03 |
| 1983 | .01 | .03 |
| 1984 | .01 | .03 |
| 1985 | .04 | .06 |
| 1986 | .12 | .11 |
| 1987 | .19 | .17 |
| 1988 | .21 | .17 |
| 1989 | .25 | .22 |
| 1990 | .28 | .23 |
| 1991 | .31 | .25 |
| 1992 | .28 | .23 |
| 1993 | .32 | .26 |
| 1994 | .37 | .30 |
| 1995 | .43 | .35 |
| 1996 | .46 | .36 |
| 1997 | .51 | .40 |
| 1998 | .51 | .41 |
| 1999 | .53 | .42 |
| 2000 | .54 | .43 |
| 2001 | .46 | .38 |
| 2002 | .49 | .39 |
| 2003 | .52 | .42 |
| 2004 | .52 | .42 |
| 2005 | .51 | .41 |
| 2006 | .53 | .43 |
| 2007 | .53 | .43 |
| 2008 | .54 | .44 |
| 2009 | .53 | .44 |
| 2010 | .52 | .44 |
| 2011 | .55 | .47 |
| 2012 | .57 | .48 |
| 2013 | .57 | .46 |
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