|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 5.80 | 6.77 |
| 1987 | 6.66 | 7.46 |
| 1988 | 7.60 | 7.42 |
| 1989 | 10.39 | 7.53 |
| 1990 | 10.63 | 6.90 |
| 1991 | 10.97 | 7.46 |
| 1992 | 11.04 | 7.32 |
| 1993 | 12.61 | 7.01 |
| 1994 | 12.88 | 8.06 |
| 1995 | 13.04 | 10.24 |
| 1996 | 11.19 | 9.27 |
| 1997 | 12.27 | 9.68 |
| 1998 | 14.09 | 10.26 |
| 1999 | 13.74 | 11.03 |
| 2000 | 12.63 | 11.12 |
| 2001 | 13.55 | 12.95 |
| 2002 | 30.82 | 12.74 |
| 2003 | 42.42 | 14.75 |
| 2004 | 39.88 | 14.31 |
| 2005 | 40.31 | 16.78 |
| 2006 | 40.41 | 20.92 |
| 2007 | 45.73 | 20.26 |
| 2008 | 44.78 | 22.62 |
| 2009 | 38.16 | 22.08 |
| 2010 | 44.64 | 26.06 |
|
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