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Loading...
| year | production | consumption |
| 1980 | .03 | .51 |
| 1981 | .09 | .55 |
| 1982 | .13 | .54 |
| 1983 | .15 | .57 |
| 1984 | .20 | .63 |
| 1985 | .33 | .70 |
| 1986 | .34 | .72 |
| 1987 | .35 | .79 |
| 1988 | .42 | .91 |
| 1989 | .45 | 1.07 |
| 1990 | .52 | 1.25 |
| 1991 | .57 | 1.37 |
| 1992 | .59 | 1.47 |
| 1993 | .65 | 1.68 |
| 1994 | .73 | 1.87 |
| 1995 | .81 | 2.12 |
| 1996 | .97 | 2.44 |
| 1997 | 1.13 | 2.59 |
| 1998 | 1.12 | 2.44 |
| 1999 | 1.17 | 2.49 |
| 2000 | 1.27 | 2.56 |
| 2001 | 1.31 | 2.69 |
| 2002 | 1.41 | 2.93 |
| 2003 | 1.56 | 3.20 |
| 2004 | 1.60 | 3.44 |
| 2005 | 1.73 | 3.76 |
| 2006 | 1.82 | 3.90 |
| 2007 | 1.91 | 4.04 |
| 2008 | 2.04 | 4.09 |
| 2009 | 2.14 | 4.25 |
| 2010 | 2.34 | 4.48 |
| 2011 | 2.46 | 4.62 |
| 2012 | 2.65 | 4.83 |
| 2013 | 2.65 | 4.75 |
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