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| year | production | consumption |
| 1980 | 1.60 | 1.64 |
| 1981 | 1.67 | 1.59 |
| 1982 | 1.73 | 1.68 |
| 1983 | 1.79 | 1.69 |
| 1984 | 1.85 | 1.84 |
| 1985 | 1.83 | 1.75 |
| 1986 | 1.84 | 1.90 |
| 1987 | 1.83 | 1.95 |
| 1988 | 1.91 | 1.95 |
| 1989 | 1.99 | 1.94 |
| 1990 | 2.02 | 1.88 |
| 1991 | 2.10 | 1.97 |
| 1992 | 2.28 | 2.04 |
| 1993 | 2.48 | 2.20 |
| 1994 | 2.69 | 2.24 |
| 1995 | 2.91 | 2.31 |
| 1996 | 3.03 | 2.39 |
| 1997 | 3.28 | 2.46 |
| 1998 | 3.38 | 2.57 |
| 1999 | 3.41 | 2.61 |
| 2000 | 3.49 | 2.67 |
| 2001 | 3.66 | 2.62 |
| 2002 | 3.57 | 2.48 |
| 2003 | 3.74 | 2.67 |
| 2004 | 3.76 | 2.78 |
| 2005 | 3.75 | 3.11 |
| 2006 | 3.82 | 3.31 |
| 2007 | 3.66 | 3.35 |
| 2008 | 3.63 | 3.48 |
| 2009 | 3.54 | 3.41 |
| 2010 | 3.43 | 3.54 |
| 2011 | 3.26 | 3.67 |
| 2012 | 3.12 | 3.65 |
| 2013 | 3.09 | 3.82 |
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