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Loading...
| year | production | consumption |
| 1980 | 3.99 | .48 |
| 1981 | 2.63 | .35 |
| 1982 | 1.95 | .35 |
| 1983 | 2.51 | .39 |
| 1984 | 2.76 | .41 |
| 1985 | 2.44 | .40 |
| 1986 | 3.36 | .45 |
| 1987 | 3.77 | .54 |
| 1988 | 3.63 | .62 |
| 1989 | 4.32 | .70 |
| 1990 | 2.83 | .45 |
| 1991 | .43 | .22 |
| 1992 | 2.44 | .35 |
| 1993 | 4.28 | .48 |
| 1994 | 4.73 | .57 |
| 1995 | 4.81 | .59 |
| 1996 | 4.94 | .75 |
| 1997 | 4.85 | .80 |
| 1998 | 5.02 | .85 |
| 1999 | 4.60 | .86 |
| 2000 | 5.04 | .91 |
| 2001 | 4.81 | .88 |
| 2002 | 4.58 | .89 |
| 2003 | 5.14 | .96 |
| 2004 | 5.71 | 1.01 |
| 2005 | 6.11 | 1.15 |
| 2006 | 6.13 | 1.14 |
| 2007 | 5.97 | 1.16 |
| 2008 | 6.28 | 1.23 |
| 2009 | 5.68 | 1.21 |
| 2010 | 5.62 | 1.34 |
| 2011 | 6.19 | 1.50 |
| 2012 | 6.52 | 1.54 |
| 2013 | 6.56 | 1.59 |
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