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Loading...
| year | production | consumption |
| 1980 | .15 | .17 |
| 1981 | .18 | .19 |
| 1982 | .19 | .21 |
| 1983 | .19 | .21 |
| 1984 | .15 | .21 |
| 1985 | .17 | .21 |
| 1986 | .18 | .23 |
| 1987 | .20 | .26 |
| 1988 | .22 | .26 |
| 1989 | .25 | .26 |
| 1990 | .29 | .27 |
| 1991 | .38 | .29 |
| 1992 | .45 | .31 |
| 1993 | .55 | .37 |
| 1994 | .60 | .41 |
| 1995 | .75 | .50 |
| 1996 | .81 | .59 |
| 1997 | .81 | .58 |
| 1998 | .95 | .61 |
| 1999 | 1.04 | .68 |
| 2000 | 1.16 | .74 |
| 2001 | 1.32 | .81 |
| 2002 | 1.38 | .90 |
| 2003 | 1.45 | .98 |
| 2004 | 1.81 | 1.09 |
| 2005 | 1.99 | 1.25 |
| 2006 | 2.09 | 1.32 |
| 2007 | 2.14 | 1.47 |
| 2008 | 2.11 | 1.63 |
| 2009 | 2.32 | 1.83 |
| 2010 | 2.33 | 2.03 |
| 2011 | 2.46 | 2.17 |
| 2012 | 2.58 | 2.38 |
| 2013 | 2.50 | 2.34 |
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