|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 26.26 | 30.15 |
| 1987 | 27.28 | 31.92 |
| 1988 | 32.02 | 35.93 |
| 1989 | 36.45 | 41.61 |
| 1990 | 40.88 | 45.55 |
| 1991 | 41.57 | 46.09 |
| 1992 | 42.58 | 48.07 |
| 1993 | 45.57 | 53.60 |
| 1994 | 53.73 | 58.73 |
| 1995 | 57.93 | 63.56 |
| 1996 | 57.79 | 71.84 |
| 1997 | 60.06 | 78.54 |
| 1998 | 69.84 | 80.34 |
| 1999 | 70.26 | 87.31 |
| 2000 | 75.78 | 81.88 |
| 2001 | 77.95 | 83.91 |
| 2002 | 77.56 | 86.39 |
| 2003 | 79.04 | 86.42 |
| 2004 | 75.32 | 98.06 |
| 2005 | 72.27 | 105.40 |
| 2006 | 76.01 | 115.24 |
| 2007 | 64.73 | 118.43 |
| 2008 | 77.89 | 168.35 |
| 2009 | 70.39 | 150.57 |
| 2010 | 59.72 | 144.98 |
|
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