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| year | production | consumption |
| 1980 | .66 | .42 |
| 1981 | .63 | .44 |
| 1982 | .71 | .46 |
| 1983 | .93 | .52 |
| 1984 | 1.31 | .61 |
| 1985 | 1.43 | .70 |
| 1986 | 1.66 | .75 |
| 1987 | 1.68 | .75 |
| 1988 | 1.81 | .80 |
| 1989 | 1.92 | .86 |
| 1990 | 2.03 | .98 |
| 1991 | 2.19 | 1.09 |
| 1992 | 2.26 | 1.14 |
| 1993 | 2.34 | 1.29 |
| 1994 | 2.41 | 1.43 |
| 1995 | 2.59 | 1.47 |
| 1996 | 2.84 | 1.67 |
| 1997 | 3.01 | 1.67 |
| 1998 | 3.14 | 1.69 |
| 1999 | 3.16 | 1.72 |
| 2000 | 3.31 | 1.98 |
| 2001 | 3.34 | 2.10 |
| 2002 | 3.43 | 2.24 |
| 2003 | 3.66 | 2.16 |
| 2004 | 3.71 | 2.19 |
| 2005 | 3.74 | 2.30 |
| 2006 | 3.67 | 2.36 |
| 2007 | 3.79 | 2.59 |
| 2008 | 3.88 | 2.74 |
| 2009 | 3.81 | 2.84 |
| 2010 | 3.84 | 3.03 |
| 2011 | 3.74 | 3.22 |
| 2012 | 3.78 | 3.23 |
| 2013 | 3.80 | 3.25 |
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