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Loading...
| year | production | consumption |
| 1980 | .41 | .27 |
| 1981 | .41 | .29 |
| 1982 | .40 | .30 |
| 1983 | .41 | .33 |
| 1984 | .43 | .37 |
| 1985 | .44 | .39 |
| 1986 | .48 | .38 |
| 1987 | .57 | .44 |
| 1988 | .65 | .45 |
| 1989 | .83 | .48 |
| 1990 | 1.00 | .56 |
| 1991 | 1.26 | .52 |
| 1992 | 1.24 | .54 |
| 1993 | 1.41 | .60 |
| 1994 | 1.43 | .63 |
| 1995 | 1.44 | .61 |
| 1996 | 1.51 | .65 |
| 1997 | 1.48 | .70 |
| 1998 | 1.50 | .75 |
| 1999 | 1.48 | .77 |
| 2000 | 1.46 | .78 |
| 2001 | 1.37 | .76 |
| 2002 | 1.42 | .82 |
| 2003 | 1.40 | .83 |
| 2004 | 1.38 | .85 |
| 2005 | 1.29 | .81 |
| 2006 | 1.23 | .81 |
| 2007 | 1.16 | .85 |
| 2008 | 1.13 | .98 |
| 2009 | 1.13 | .99 |
| 2010 | 1.26 | 1.02 |
| 2011 | 1.13 | .94 |
| 2012 | .64 | .74 |
| 2013 | .38 | .88 |
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