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| year | production | consumption |
| 1980 | 3.89 | .27 |
| 1981 | 3.45 | .44 |
| 1982 | 3.00 | .41 |
| 1983 | 2.91 | .51 |
| 1984 | 3.00 | .58 |
| 1985 | 3.29 | .80 |
| 1986 | 3.68 | .91 |
| 1987 | 4.21 | 1.07 |
| 1988 | 4.22 | 1.17 |
| 1989 | 4.99 | 1.27 |
| 1990 | 5.51 | 1.23 |
| 1991 | 6.24 | 1.49 |
| 1992 | 6.11 | 1.61 |
| 1993 | 5.78 | 1.51 |
| 1994 | 5.84 | 1.49 |
| 1995 | 6.14 | 1.61 |
| 1996 | 6.34 | 1.67 |
| 1997 | 6.50 | 1.77 |
| 1998 | 6.61 | 1.84 |
| 1999 | 6.25 | 1.87 |
| 2000 | 6.77 | 1.87 |
| 2001 | 6.59 | 1.89 |
| 2002 | 6.50 | 2.06 |
| 2003 | 7.13 | 2.11 |
| 2004 | 7.42 | 2.22 |
| 2005 | 7.59 | 2.59 |
| 2006 | 7.87 | 2.73 |
| 2007 | 7.92 | 3.06 |
| 2008 | 8.13 | 3.45 |
| 2009 | 7.52 | 3.44 |
| 2010 | 7.64 | 3.58 |
| 2011 | 8.46 | 3.75 |
| 2012 | 8.92 | 3.92 |
| 2013 | 8.99 | 4.00 |
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