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Loading...
| year | production | consumption |
| 1980 | .22 | .14 |
| 1981 | .24 | .16 |
| 1982 | .24 | .17 |
| 1983 | .25 | .18 |
| 1984 | .24 | .17 |
| 1985 | .27 | .21 |
| 1986 | .30 | .22 |
| 1987 | .33 | .27 |
| 1988 | .30 | .23 |
| 1989 | .30 | .23 |
| 1990 | .31 | .26 |
| 1991 | .33 | .29 |
| 1992 | .29 | .24 |
| 1993 | .35 | .29 |
| 1994 | .35 | .28 |
| 1995 | .34 | .28 |
| 1996 | .33 | .28 |
| 1997 | .40 | .34 |
| 1998 | .40 | .35 |
| 1999 | .41 | .36 |
| 2000 | .42 | .37 |
| 2001 | .43 | .38 |
| 2002 | .45 | .40 |
| 2003 | .45 | .41 |
| 2004 | .46 | .42 |
| 2005 | .48 | .46 |
| 2006 | .50 | .49 |
| 2007 | .52 | .51 |
| 2008 | .54 | .54 |
| 2009 | .54 | .55 |
| 2010 | .55 | .55 |
| 2011 | .55 | .55 |
| 2012 | .61 | .59 |
| 2013 | .70 | .68 |
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