|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 4.05 | 4.23 |
| 1987 | 4.14 | 4.29 |
| 1988 | 4.19 | 4.37 |
| 1989 | 4.14 | 4.32 |
| 1990 | 4.04 | 4.23 |
| 1991 | 4.47 | 4.22 |
| 1992 | 4.76 | 5.80 |
| 1993 | 4.15 | 5.28 |
| 1994 | 3.79 | 6.23 |
| 1995 | 3.72 | 6.86 |
| 1996 | 4.68 | 7.76 |
| 1997 | 6.43 | 6.78 |
| 1998 | 8.47 | 8.01 |
| 1999 | 8.01 | 9.05 |
| 2000 | 7.65 | 9.48 |
| 2001 | 8.94 | 10.48 |
| 2002 | 7.68 | 9.90 |
| 2003 | 7.53 | 9.54 |
| 2004 | 8.03 | 9.39 |
| 2005 | 7.29 | 9.59 |
| 2006 | 7.58 | 10.81 |
| 2007 | 7.21 | 9.56 |
| 2008 | 6.31 | 9.52 |
| 2009 | 7.42 | 10.68 |
| 2010 | 6.99 | 10.11 |
|
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