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| year | production | consumption |
| 1980 | 3.16 | 3.11 |
| 1981 | 2.94 | 2.78 |
| 1982 | 2.54 | 2.77 |
| 1983 | 2.72 | 2.74 |
| 1984 | 2.76 | 2.90 |
| 1985 | 2.92 | 3.04 |
| 1986 | 2.74 | 3.16 |
| 1987 | 2.73 | 3.24 |
| 1988 | 2.42 | 3.24 |
| 1989 | 2.60 | 3.26 |
| 1990 | 2.64 | 3.33 |
| 1991 | 2.95 | 3.52 |
| 1992 | 2.93 | 3.49 |
| 1993 | 2.98 | 3.56 |
| 1994 | 2.91 | 3.53 |
| 1995 | 2.91 | 3.58 |
| 1996 | 3.25 | 3.73 |
| 1997 | 2.88 | 3.70 |
| 1998 | 2.77 | 3.70 |
| 1999 | 2.56 | 3.69 |
| 2000 | 2.47 | 3.79 |
| 2001 | 2.63 | 3.94 |
| 2002 | 2.62 | 3.94 |
| 2003 | 2.53 | 4.00 |
| 2004 | 2.94 | 4.11 |
| 2005 | 2.70 | 4.20 |
| 2006 | 2.65 | 4.15 |
| 2007 | 2.65 | 4.24 |
| 2008 | 2.87 | 4.21 |
| 2009 | 2.71 | 4.05 |
| 2010 | 3.01 | 4.25 |
| 2011 | 2.77 | 4.05 |
| 2012 | 2.76 | 4.03 |
| 2013 | 2.93 | 3.94 |
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