|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 18.31 | 20.44 |
| 1987 | 17.99 | 22.10 |
| 1988 | 19.11 | 22.07 |
| 1989 | 20.57 | 23.75 |
| 1990 | 22.55 | 26.92 |
| 1991 | 22.10 | 24.90 |
| 1992 | 23.14 | 26.02 |
| 1993 | 24.08 | 27.74 |
| 1994 | 23.33 | 27.58 |
| 1995 | 23.21 | 26.88 |
| 1996 | 23.61 | 26.17 |
| 1997 | 24.63 | 26.38 |
| 1998 | 24.66 | 28.58 |
| 1999 | 22.88 | 27.37 |
| 2000 | 26.55 | 26.50 |
| 2001 | 31.00 | 26.00 |
| 2002 | 24.84 | 25.52 |
| 2003 | 29.89 | 28.79 |
| 2004 | 30.90 | 30.76 |
| 2005 | 31.43 | 31.32 |
| 2006 | 28.46 | 26.59 |
| 2007 | 24.23 | 26.88 |
| 2008 | 30.07 | 35.62 |
| 2009 | 31.27 | 44.99 |
| 2010 | 28.91 | 52.47 |
|
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