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| year | production | consumption |
| 1980 | .48 | 1.14 |
| 1981 | .52 | 1.05 |
| 1982 | .52 | 1.03 |
| 1983 | .52 | 1.09 |
| 1984 | .49 | 1.06 |
| 1985 | .55 | 1.15 |
| 1986 | .56 | 1.16 |
| 1987 | .58 | 1.17 |
| 1988 | .60 | 1.19 |
| 1989 | .54 | 1.15 |
| 1990 | .55 | 1.18 |
| 1991 | .57 | 1.22 |
| 1992 | .58 | 1.23 |
| 1993 | .61 | 1.23 |
| 1994 | .65 | 1.25 |
| 1995 | .61 | 1.24 |
| 1996 | .55 | 1.22 |
| 1997 | .61 | 1.24 |
| 1998 | .61 | 1.27 |
| 1999 | .67 | 1.33 |
| 2000 | .65 | 1.30 |
| 2001 | .70 | 1.35 |
| 2002 | .64 | 1.28 |
| 2003 | .64 | 1.30 |
| 2004 | .62 | 1.29 |
| 2005 | .56 | 1.26 |
| 2006 | .60 | 1.29 |
| 2007 | .64 | 1.28 |
| 2008 | .63 | 1.31 |
| 2009 | .63 | 1.28 |
| 2010 | .62 | 1.31 |
| 2011 | .59 | 1.23 |
| 2012 | .63 | 1.27 |
| 2013 | .64 | 1.31 |
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