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Loading...
| year | production | consumption |
| 1980 | .14 | .05 |
| 1981 | .21 | .05 |
| 1982 | .26 | .06 |
| 1983 | .27 | .06 |
| 1984 | .32 | .06 |
| 1985 | .43 | .06 |
| 1986 | .41 | .07 |
| 1987 | .40 | .07 |
| 1988 | .38 | .07 |
| 1989 | .40 | .08 |
| 1990 | .38 | .08 |
| 1991 | .36 | .08 |
| 1992 | .33 | .08 |
| 1993 | .30 | .07 |
| 1994 | .26 | .08 |
| 1995 | .27 | .08 |
| 1996 | .26 | .08 |
| 1997 | .30 | .08 |
| 1998 | .29 | .08 |
| 1999 | .25 | .08 |
| 2000 | .22 | .08 |
| 2001 | .20 | .08 |
| 2002 | .18 | .08 |
| 2003 | .18 | .08 |
| 2004 | .18 | .09 |
| 2005 | .22 | .09 |
| 2006 | .23 | .10 |
| 2007 | .22 | .10 |
| 2008 | .22 | .11 |
| 2009 | .21 | .11 |
| 2010 | .19 | .13 |
| 2011 | .18 | .13 |
| 2012 | .16 | .14 |
| 2013 | .20 | .12 |
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