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Loading...
| year | production | consumption |
| 1980 | .17 | .76 |
| 1981 | .22 | .73 |
| 1982 | .25 | .72 |
| 1983 | .27 | .74 |
| 1984 | .29 | .77 |
| 1985 | .31 | .81 |
| 1986 | .32 | .84 |
| 1987 | .36 | .90 |
| 1988 | .37 | .96 |
| 1989 | .38 | 1.00 |
| 1990 | .37 | 1.04 |
| 1991 | .39 | 1.06 |
| 1992 | .33 | 1.02 |
| 1993 | .35 | 1.07 |
| 1994 | .35 | 1.09 |
| 1995 | .36 | 1.12 |
| 1996 | .35 | 1.15 |
| 1997 | .39 | 1.20 |
| 1998 | .40 | 1.27 |
| 1999 | .39 | 1.27 |
| 2000 | .40 | 1.34 |
| 2001 | .40 | 1.36 |
| 2002 | .41 | 1.36 |
| 2003 | .42 | 1.44 |
| 2004 | .42 | 1.43 |
| 2005 | .42 | 1.44 |
| 2006 | .40 | 1.48 |
| 2007 | .38 | 1.50 |
| 2008 | .39 | 1.47 |
| 2009 | .41 | 1.40 |
| 2010 | .39 | 1.35 |
| 2011 | .38 | 1.30 |
| 2012 | .41 | 1.21 |
| 2013 | .41 | 1.15 |
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