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| year | production | consumption |
| 1980 | 10.28 | 9.86 |
| 1981 | 10.09 | 9.58 |
| 1982 | 10.10 | 9.08 |
| 1983 | 10.36 | 9.07 |
| 1984 | 11.34 | 9.75 |
| 1985 | 12.02 | 10.12 |
| 1986 | 11.93 | 10.22 |
| 1987 | 12.57 | 10.56 |
| 1988 | 13.41 | 11.01 |
| 1989 | 13.33 | 11.16 |
| 1990 | 13.41 | 10.96 |
| 1991 | 13.96 | 11.06 |
| 1992 | 14.46 | 11.42 |
| 1993 | 15.38 | 11.67 |
| 1994 | 16.34 | 11.99 |
| 1995 | 16.83 | 12.17 |
| 1996 | 17.23 | 12.52 |
| 1997 | 17.48 | 12.61 |
| 1998 | 17.44 | 12.31 |
| 1999 | 17.68 | 12.92 |
| 2000 | 18.13 | 13.01 |
| 2001 | 18.02 | 12.76 |
| 2002 | 18.36 | 13.00 |
| 2003 | 18.27 | 13.35 |
| 2004 | 18.66 | 13.68 |
| 2005 | 18.88 | 13.58 |
| 2006 | 19.23 | 13.69 |
| 2007 | 19.54 | 13.57 |
| 2008 | 19.06 | 13.56 |
| 2009 | 18.36 | 13.06 |
| 2010 | 18.37 | 13.55 |
| 2011 | 18.86 | 13.86 |
| 2012 | 19.13 | 13.79 |
| 2013 | 18.94 | 14.19 |
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