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| year | production | consumption |
| 1980 | 11.40 | 9.17 |
| 1981 | 11.52 | 9.16 |
| 1982 | 11.46 | 9.32 |
| 1983 | 11.69 | 9.28 |
| 1984 | 12.55 | 9.93 |
| 1985 | 12.82 | 10.18 |
| 1986 | 13.72 | 11.08 |
| 1987 | 13.65 | 11.31 |
| 1988 | 14.52 | 11.62 |
| 1989 | 15.11 | 11.99 |
| 1990 | 16.00 | 12.40 |
| 1991 | 16.83 | 12.86 |
| 1992 | 17.15 | 13.12 |
| 1993 | 18.03 | 13.79 |
| 1994 | 18.99 | 14.47 |
| 1995 | 20.29 | 15.11 |
| 1996 | 21.58 | 15.93 |
| 1997 | 23.18 | 16.69 |
| 1998 | 23.84 | 17.34 |
| 1999 | 23.40 | 17.29 |
| 2000 | 24.83 | 17.79 |
| 2001 | 24.77 | 17.94 |
| 2002 | 23.99 | 17.84 |
| 2003 | 23.97 | 18.07 |
| 2004 | 25.30 | 18.89 |
| 2005 | 26.16 | 19.76 |
| 2006 | 26.87 | 20.63 |
| 2007 | 26.89 | 20.97 |
| 2008 | 27.52 | 22.06 |
| 2009 | 27.68 | 21.86 |
| 2010 | 28.37 | 23.18 |
| 2011 | 30.08 | 24.35 |
| 2012 | 30.00 | 24.80 |
| 2013 | 29.80 | 25.08 |
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