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Loading...
| year | production | consumption |
| 1980 | .12 | .15 |
| 1981 | .11 | .15 |
| 1982 | .11 | .14 |
| 1983 | .11 | .15 |
| 1984 | .11 | .15 |
| 1985 | .12 | .15 |
| 1986 | .13 | .17 |
| 1987 | .16 | .20 |
| 1988 | .15 | .19 |
| 1989 | .16 | .21 |
| 1990 | .18 | .23 |
| 1991 | .20 | .25 |
| 1992 | .19 | .24 |
| 1993 | .16 | .21 |
| 1994 | .15 | .20 |
| 1995 | .15 | .20 |
| 1996 | .14 | .20 |
| 1997 | .13 | .20 |
| 1998 | .13 | .20 |
| 1999 | .15 | .24 |
| 2000 | .15 | .23 |
| 2001 | .14 | .21 |
| 2002 | .15 | .21 |
| 2003 | .15 | .20 |
| 2004 | .15 | .18 |
| 2005 | .15 | .19 |
| 2006 | .15 | .20 |
| 2007 | .14 | .18 |
| 2008 | .13 | .16 |
| 2009 | .13 | .16 |
| 2010 | .14 | .17 |
| 2011 | .14 | .17 |
| 2012 | .13 | .17 |
| 2013 | .13 | .18 |
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