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Loading...
| year | production | consumption |
| 1980 | .15 | .08 |
| 1981 | .14 | .08 |
| 1982 | .15 | .07 |
| 1983 | .15 | .08 |
| 1984 | .16 | .07 |
| 1985 | .15 | .07 |
| 1986 | .15 | .07 |
| 1987 | .15 | .07 |
| 1988 | .16 | .08 |
| 1989 | .17 | .09 |
| 1990 | .17 | .09 |
| 1991 | .17 | .09 |
| 1992 | .18 | .10 |
| 1993 | .17 | .10 |
| 1994 | .18 | .11 |
| 1995 | .20 | .12 |
| 1996 | .20 | .12 |
| 1997 | .21 | .14 |
| 1998 | .21 | .13 |
| 1999 | .19 | .14 |
| 2000 | .22 | .16 |
| 2001 | .28 | .15 |
| 2002 | .32 | .16 |
| 2003 | .36 | .20 |
| 2004 | .51 | .20 |
| 2005 | .59 | .20 |
| 2006 | .62 | .21 |
| 2007 | .66 | .24 |
| 2008 | .66 | .24 |
| 2009 | .57 | .24 |
| 2010 | .64 | .24 |
| 2011 | .70 | .24 |
| 2012 | .80 | .30 |
| 2013 | .91 | .28 |
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