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Loading...
| year | production | consumption |
| 1980 | .64 | .07 |
| 1981 | .72 | .07 |
| 1982 | .74 | .08 |
| 1983 | .86 | .10 |
| 1984 | .94 | .10 |
| 1985 | 1.13 | .12 |
| 1986 | 1.28 | .14 |
| 1987 | 1.34 | .14 |
| 1988 | 1.41 | .13 |
| 1989 | 1.49 | .17 |
| 1990 | 1.59 | .18 |
| 1991 | 1.64 | .21 |
| 1992 | 1.72 | .20 |
| 1993 | 1.82 | .23 |
| 1994 | 1.90 | .24 |
| 1995 | 2.00 | .22 |
| 1996 | 2.07 | .23 |
| 1997 | 2.13 | .27 |
| 1998 | 2.20 | .35 |
| 1999 | 2.17 | .30 |
| 2000 | 2.43 | .34 |
| 2001 | 2.48 | .35 |
| 2002 | 2.48 | .36 |
| 2003 | 2.35 | .36 |
| 2004 | 2.26 | .38 |
| 2005 | 2.39 | .48 |
| 2006 | 2.45 | .55 |
| 2007 | 2.40 | .58 |
| 2008 | 2.50 | .75 |
| 2009 | 2.64 | .75 |
| 2010 | 2.84 | .95 |
| 2011 | 2.86 | .97 |
| 2012 | 3.15 | 1.23 |
| 2013 | 3.20 | 1.13 |
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