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| year | production | consumption |
| 1980 | .38 | 1.76 |
| 1981 | .41 | 1.83 |
| 1982 | .41 | 1.85 |
| 1983 | .47 | 2.01 |
| 1984 | .52 | 2.12 |
| 1985 | .60 | 2.26 |
| 1986 | .74 | 2.49 |
| 1987 | .86 | 2.77 |
| 1988 | .85 | 3.10 |
| 1989 | .87 | 3.39 |
| 1990 | .86 | 3.83 |
| 1991 | .85 | 4.34 |
| 1992 | .79 | 4.83 |
| 1993 | .77 | 5.45 |
| 1994 | .72 | 5.87 |
| 1995 | .77 | 6.37 |
| 1996 | .82 | 6.68 |
| 1997 | .84 | 7.36 |
| 1998 | .98 | 6.72 |
| 1999 | 1.10 | 7.52 |
| 2000 | 1.23 | 8.02 |
| 2001 | 1.25 | 8.26 |
| 2002 | 1.23 | 8.51 |
| 2003 | 1.34 | 8.74 |
| 2004 | 1.34 | 8.96 |
| 2005 | 1.48 | 9.27 |
| 2006 | 1.51 | 9.40 |
| 2007 | 1.47 | 9.78 |
| 2008 | 1.54 | 9.95 |
| 2009 | 1.52 | 10.05 |
| 2010 | 1.54 | 10.95 |
| 2011 | 1.61 | 11.21 |
| 2012 | 1.56 | 11.28 |
| 2013 | 1.44 | 11.35 |
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