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| year | production | consumption |
| 1980 | 1.09 | 6.07 |
| 1981 | 1.12 | 5.87 |
| 1982 | 1.17 | 5.76 |
| 1983 | 1.12 | 5.60 |
| 1984 | 1.17 | 6.00 |
| 1985 | 1.17 | 6.02 |
| 1986 | 1.25 | 6.11 |
| 1987 | 1.19 | 6.33 |
| 1988 | 1.26 | 6.49 |
| 1989 | 1.19 | 6.68 |
| 1990 | 1.19 | 6.72 |
| 1991 | 1.29 | 6.87 |
| 1992 | 1.32 | 6.84 |
| 1993 | 1.35 | 6.82 |
| 1994 | 1.42 | 6.72 |
| 1995 | 1.36 | 7.03 |
| 1996 | 1.43 | 7.07 |
| 1997 | 1.42 | 7.16 |
| 1998 | 1.40 | 7.38 |
| 1999 | 1.35 | 7.50 |
| 2000 | 1.32 | 7.57 |
| 2001 | 1.30 | 7.62 |
| 2002 | 1.22 | 7.64 |
| 2003 | 1.18 | 7.87 |
| 2004 | 1.26 | 8.07 |
| 2005 | 1.19 | 8.11 |
| 2006 | 1.16 | 8.06 |
| 2007 | 1.08 | 7.96 |
| 2008 | 1.13 | 7.89 |
| 2009 | 1.15 | 7.36 |
| 2010 | 1.27 | 7.66 |
| 2011 | 1.34 | 7.48 |
| 2012 | 1.41 | 7.20 |
| 2013 | 1.57 | 6.98 |
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