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Loading...
| year | production | consumption |
| 1980 | 5.71 | 3.70 |
| 1981 | 6.74 | 3.79 |
| 1982 | 7.79 | 4.20 |
| 1983 | 7.66 | 4.08 |
| 1984 | 7.89 | 4.15 |
| 1985 | 7.83 | 4.37 |
| 1986 | 7.10 | 4.30 |
| 1987 | 7.35 | 4.42 |
| 1988 | 7.35 | 4.50 |
| 1989 | 7.37 | 4.75 |
| 1990 | 7.64 | 4.64 |
| 1991 | 7.96 | 4.97 |
| 1992 | 7.97 | 5.07 |
| 1993 | 8.07 | 5.21 |
| 1994 | 8.15 | 5.42 |
| 1995 | 8.09 | 5.33 |
| 1996 | 8.79 | 5.53 |
| 1997 | 9.09 | 5.68 |
| 1998 | 9.35 | 5.99 |
| 1999 | 9.09 | 6.12 |
| 2000 | 9.38 | 6.35 |
| 2001 | 9.59 | 6.31 |
| 2002 | 9.65 | 6.32 |
| 2003 | 10.10 | 6.43 |
| 2004 | 10.01 | 6.45 |
| 2005 | 10.03 | 6.69 |
| 2006 | 10.06 | 6.92 |
| 2007 | 9.76 | 7.14 |
| 2008 | 9.17 | 7.24 |
| 2009 | 8.62 | 6.96 |
| 2010 | 8.83 | 7.29 |
| 2011 | 8.87 | 7.53 |
| 2012 | 8.73 | 7.50 |
| 2013 | 8.54 | 7.74 |
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