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Loading...
| year | production | consumption |
| 1980 | .05 | .13 |
| 1981 | .06 | .14 |
| 1982 | .07 | .15 |
| 1983 | .07 | .14 |
| 1984 | .10 | .17 |
| 1985 | .10 | .17 |
| 1986 | .11 | .19 |
| 1987 | .13 | .21 |
| 1988 | .15 | .23 |
| 1989 | .17 | .25 |
| 1990 | .16 | .25 |
| 1991 | .17 | .26 |
| 1992 | .20 | .29 |
| 1993 | .22 | .31 |
| 1994 | .24 | .34 |
| 1995 | .26 | .38 |
| 1996 | .27 | .39 |
| 1997 | .28 | .40 |
| 1998 | .30 | .42 |
| 1999 | .33 | .47 |
| 2000 | .35 | .50 |
| 2001 | .37 | .55 |
| 2002 | .41 | .59 |
| 2003 | .46 | .64 |
| 2004 | .50 | .68 |
| 2005 | .54 | .72 |
| 2006 | .59 | .79 |
| 2007 | .62 | .82 |
| 2008 | .69 | .89 |
| 2009 | .75 | .97 |
| 2010 | .76 | .94 |
| 2011 | .77 | 1.00 |
| 2012 | .84 | 1.08 |
| 2013 | .87 | 1.13 |
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