|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 60.25 | 7.65 |
| 1987 | 67.63 | 17.09 |
| 1988 | 63.91 | 20.07 |
| 1989 | 65.97 | 18.07 |
| 1990 | 65.72 | 18.13 |
| 1991 | 78.43 | 13.79 |
| 1992 | 69.59 | 19.11 |
| 1993 | 66.92 | 13.41 |
| 1994 | 57.83 | 8.75 |
| 1995 | 61.84 | 13.63 |
| 1996 | 55.99 | 5.71 |
| 1997 | 58.08 | 7.38 |
| 1998 | 55.44 | 8.53 |
| 1999 | 61.21 | 9.80 |
| 2000 | 57.41 | 11.08 |
| 2001 | 61.11 | 13.33 |
| 2002 | 61.18 | 14.23 |
| 2003 | 57.62 | 8.94 |
| 2004 | 64.67 | 7.71 |
| 2005 | 59.93 | 9.92 |
| 2006 | 54.79 | 11.24 |
| 2007 | 60.54 | 17.61 |
| 2008 | 60.54 | 3.14 |
| 2009 | 62.97 | 6.66 |
| 2010 | 70.68 | 8.65 |
|
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