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Loading...
| year | production | consumption |
| 1980 | .25 | .13 |
| 1981 | .26 | .14 |
| 1982 | .27 | .13 |
| 1983 | .27 | .15 |
| 1984 | .28 | .17 |
| 1985 | .26 | .17 |
| 1986 | .25 | .18 |
| 1987 | .24 | .17 |
| 1988 | .24 | .18 |
| 1989 | .24 | .20 |
| 1990 | .22 | .20 |
| 1991 | .23 | .20 |
| 1992 | .25 | .19 |
| 1993 | .23 | .22 |
| 1994 | .21 | .24 |
| 1995 | .20 | .21 |
| 1996 | .22 | .23 |
| 1997 | .25 | .27 |
| 1998 | .25 | .29 |
| 1999 | .25 | .29 |
| 2000 | .25 | .30 |
| 2001 | .24 | .34 |
| 2002 | .25 | .34 |
| 2003 | .26 | .33 |
| 2004 | .27 | .33 |
| 2005 | .26 | .36 |
| 2006 | .27 | .33 |
| 2007 | .24 | .29 |
| 2008 | .24 | .31 |
| 2009 | .24 | .30 |
| 2010 | .25 | .31 |
| 2011 | .22 | .30 |
| 2012 | .22 | .33 |
| 2013 | .21 | .35 |
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