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Loading...
| year | production | consumption |
| 1980 | .28 | 2.10 |
| 1981 | .31 | 1.87 |
| 1982 | .34 | 1.76 |
| 1983 | .40 | 1.74 |
| 1984 | .45 | 1.83 |
| 1985 | .51 | 1.90 |
| 1986 | .54 | 1.98 |
| 1987 | .54 | 2.05 |
| 1988 | .50 | 2.12 |
| 1989 | .49 | 2.16 |
| 1990 | .48 | 2.20 |
| 1991 | .47 | 2.28 |
| 1992 | .46 | 2.25 |
| 1993 | .44 | 2.24 |
| 1994 | .43 | 2.35 |
| 1995 | .43 | 2.41 |
| 1996 | .45 | 2.57 |
| 1997 | .49 | 2.64 |
| 1998 | .47 | 2.68 |
| 1999 | .51 | 2.64 |
| 2000 | .50 | 2.72 |
| 2001 | .48 | 2.68 |
| 2002 | .49 | 2.67 |
| 2003 | .49 | 2.78 |
| 2004 | .49 | 2.81 |
| 2005 | .50 | 2.77 |
| 2006 | .50 | 2.75 |
| 2007 | .52 | 2.75 |
| 2008 | .49 | 2.88 |
| 2009 | .52 | 2.67 |
| 2010 | .54 | 2.85 |
| 2011 | .56 | 2.68 |
| 2012 | .50 | 2.55 |
| 2013 | .53 | 2.61 |
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