|
| year | production | consumption |
| 1984 | 38.08 | 15.17 |
| 1985 | 37.49 | 15.09 |
| 1986 | 38.60 | 13.29 |
| 1987 | 36.26 | 12.53 |
| 1988 | 31.80 | 12.97 |
| 1989 | 41.82 | 13.29 |
| 1990 | 40.24 | 11.96 |
| 1991 | 44.76 | 11.34 |
| 1992 | 43.80 | 11.31 |
| 1993 | 48.71 | 10.88 |
| 1994 | 54.92 | 9.37 |
| 1995 | 52.46 | 9.56 |
| 1996 | 50.86 | 9.09 |
| 1997 | 46.16 | 9.14 |
| 1998 | 36.18 | 7.97 |
| 1999 | 32.87 | 7.95 |
| 2000 | 31.42 | 8.08 |
| 2001 | 32.78 | 6.47 |
| 2002 | 32.40 | 6.61 |
| 2003 | 32.19 | 7.38 |
| 2004 | 32.12 | 7.93 |
| 2005 | 34.69 | 6.66 |
| 2006 | 33.42 | 5.96 |
| 2007 | 32.76 | 4.96 |
| 2008 | 30.69 | 5.55 |
| 2009 | 27.02 | 5.92 |
| 2010 | 12.72 | 5.90 |
|
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