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Loading...
| year | production | consumption |
| 1980 | 1.20 | .21 |
| 1981 | 1.05 | .20 |
| 1982 | .93 | .24 |
| 1983 | .84 | .22 |
| 1984 | 1.09 | .27 |
| 1985 | .88 | .24 |
| 1986 | .88 | .26 |
| 1987 | .86 | .26 |
| 1988 | .99 | .27 |
| 1989 | 1.06 | .28 |
| 1990 | 1.20 | .34 |
| 1991 | 1.25 | .40 |
| 1992 | 1.39 | .48 |
| 1993 | 1.45 | .56 |
| 1994 | 1.44 | .56 |
| 1995 | 1.51 | .56 |
| 1996 | 1.66 | .58 |
| 1997 | 1.90 | .61 |
| 1998 | 2.31 | .62 |
| 1999 | 2.37 | .59 |
| 2000 | 2.83 | .65 |
| 2001 | 2.74 | .50 |
| 2002 | 2.81 | .53 |
| 2003 | 3.14 | .58 |
| 2004 | 3.70 | .71 |
| 2005 | 4.23 | .89 |
| 2006 | 4.48 | .97 |
| 2007 | 5.11 | 1.02 |
| 2008 | 5.91 | 1.08 |
| 2009 | 6.56 | 1.15 |
| 2010 | 8.10 | 1.27 |
| 2011 | 9.53 | 1.46 |
| 2012 | 9.55 | 1.66 |
| 2013 | 9.62 | 1.64 |
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