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Loading...
| year | production | consumption |
| 1980 | 4.03 | .40 |
| 1981 | 2.57 | .36 |
| 1982 | 2.61 | .35 |
| 1983 | 2.52 | .38 |
| 1984 | 2.53 | .38 |
| 1985 | 2.46 | .42 |
| 1986 | 2.43 | .44 |
| 1987 | 2.29 | .45 |
| 1988 | 2.74 | .46 |
| 1989 | 2.70 | .48 |
| 1990 | 3.18 | .51 |
| 1991 | 3.43 | .53 |
| 1992 | 3.34 | .50 |
| 1993 | 3.17 | .51 |
| 1994 | 3.21 | .53 |
| 1995 | 3.23 | .55 |
| 1996 | 3.28 | .59 |
| 1997 | 3.39 | .62 |
| 1998 | 3.26 | .59 |
| 1999 | 3.07 | .56 |
| 2000 | 3.30 | .63 |
| 2001 | 3.21 | .67 |
| 2002 | 3.11 | .70 |
| 2003 | 3.30 | .68 |
| 2004 | 3.61 | .76 |
| 2005 | 3.99 | .77 |
| 2006 | 4.22 | .74 |
| 2007 | 4.37 | .73 |
| 2008 | 4.47 | .76 |
| 2009 | 4.27 | .82 |
| 2010 | 4.31 | .94 |
| 2011 | 1.32 | .57 |
| 2012 | 3.53 | .70 |
| 2013 | 2.48 | .75 |
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