|
| year | production | consumption |
| 1984 | 9.28 | 3.72 |
| 1985 | 12.70 | 4.47 |
| 1986 | 10.29 | 5.10 |
| 1987 | 11.59 | 5.38 |
| 1988 | 7.94 | 4.95 |
| 1989 | 9.12 | 4.10 |
| 1990 | 14.27 | 3.44 |
| 1991 | 6.43 | 3.21 |
| 1992 | 3.47 | 3.27 |
| 1993 | 3.17 | 3.30 |
| 1994 | 6.07 | 3.58 |
| 1995 | 7.04 | 3.45 |
| 1996 | 3.89 | 4.05 |
| 1997 | 4.08 | 3.74 |
| 1998 | 2.79 | 3.38 |
| 1999 | 2.61 | 3.33 |
| 2000 | 2.43 | 2.45 |
| 2001 | .50 | 2.75 |
| 2002 | -3.33 | 2.76 |
| 2003 | -2.46 | 3.21 |
| 2004 | 4.27 | 2.72 |
| 2005 | 1.38 | 2.24 |
| 2006 | 4.68 | 2.24 |
| 2007 | 2.63 | 1.77 |
| 2008 | 4.86 | 1.33 |
| 2009 | 3.71 | 1.16 |
| 2010 | 5.35 | 1.47 |
|
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