|
| year | production | consumption |
| 1984 | 5.16 | 14.87 |
| 1985 | 5.85 | 13.38 |
| 1986 | 7.47 | 15.89 |
| 1987 | 6.71 | 20.75 |
| 1988 | 5.42 | 18.54 |
| 1989 | 5.12 | 21.23 |
| 1990 | 6.96 | 24.13 |
| 1991 | 8.08 | 25.42 |
| 1992 | 9.26 | 31.37 |
| 1993 | 9.47 | 28.10 |
| 1994 | 8.68 | 30.99 |
| 1995 | 7.34 | 26.91 |
| 1996 | 8.28 | 26.62 |
| 1997 | 8.58 | 27.36 |
| 1998 | 9.28 | 30.58 |
| 1999 | 8.54 | 23.33 |
| 2000 | 9.89 | 25.34 |
| 2001 | 8.87 | 36.82 |
| 2002 | 8.71 | 45.58 |
| 2003 | 11.41 | 35.82 |
| 2004 | 13.47 | 36.71 |
| 2005 | 13.76 | 43.73 |
| 2006 | 9.60 | 46.04 |
| 2007 | 8.39 | 48.21 |
| 2008 | 10.65 | 43.77 |
| 2009 | 8.87 | 30.67 |
| 2010 | 10.94 | 40.37 |
|
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