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Loading...
| year | production | consumption |
| 1980 | .67 | 2.03 |
| 1981 | .74 | 2.00 |
| 1982 | .64 | 1.84 |
| 1983 | .64 | 1.77 |
| 1984 | .74 | 1.87 |
| 1985 | .78 | 1.87 |
| 1986 | .72 | 1.82 |
| 1987 | .69 | 1.87 |
| 1988 | .70 | 1.86 |
| 1989 | .72 | 1.95 |
| 1990 | .72 | 1.97 |
| 1991 | .75 | 2.04 |
| 1992 | .73 | 1.99 |
| 1993 | .77 | 2.03 |
| 1994 | .80 | 2.15 |
| 1995 | .83 | 2.26 |
| 1996 | .90 | 2.33 |
| 1997 | .95 | 2.48 |
| 1998 | .94 | 2.54 |
| 1999 | 1.10 | 2.73 |
| 2000 | 1.20 | 2.73 |
| 2001 | 1.22 | 2.93 |
| 2002 | 1.32 | 2.98 |
| 2003 | 1.67 | 3.15 |
| 2004 | 1.79 | 3.32 |
| 2005 | 1.90 | 3.35 |
| 2006 | 2.15 | 3.47 |
| 2007 | 2.20 | 3.49 |
| 2008 | 2.25 | 3.37 |
| 2009 | 2.27 | 3.41 |
| 2010 | 2.35 | 3.51 |
| 2011 | 2.27 | 3.58 |
| 2012 | 2.32 | 3.57 |
| 2013 | 2.34 | 3.59 |
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