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| year | production | consumption |
| 1980 | .60 | 1.21 |
| 1981 | .60 | 1.20 |
| 1982 | .63 | 1.20 |
| 1983 | .63 | 1.21 |
| 1984 | .66 | 1.18 |
| 1985 | .69 | 1.22 |
| 1986 | .68 | 1.23 |
| 1987 | .70 | 1.27 |
| 1988 | .70 | 1.24 |
| 1989 | .66 | 1.24 |
| 1990 | .60 | 1.17 |
| 1991 | .57 | 1.12 |
| 1992 | .55 | 1.03 |
| 1993 | .52 | 1.02 |
| 1994 | .52 | 1.02 |
| 1995 | .52 | 1.03 |
| 1996 | .51 | 1.07 |
| 1997 | .53 | 1.04 |
| 1998 | .48 | 1.05 |
| 1999 | .46 | 1.05 |
| 2000 | .45 | 1.02 |
| 2001 | .45 | 1.06 |
| 2002 | .42 | 1.06 |
| 2003 | .39 | 1.08 |
| 2004 | .40 | 1.08 |
| 2005 | .40 | 1.16 |
| 2006 | .39 | 1.15 |
| 2007 | .38 | 1.11 |
| 2008 | .39 | 1.11 |
| 2009 | .40 | 1.04 |
| 2010 | .40 | 1.06 |
| 2011 | .39 | 1.03 |
| 2012 | .37 | .96 |
| 2013 | .35 | .95 |
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