|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 70.60 | 91.60 |
| 1987 | 78.37 | 96.41 |
| 1988 | 74.74 | 101.31 |
| 1989 | 84.00 | 111.43 |
| 1990 | 88.06 | 106.18 |
| 1991 | 84.76 | 110.89 |
| 1992 | 86.80 | 120.19 |
| 1993 | 84.11 | 121.03 |
| 1994 | 85.70 | 125.08 |
| 1995 | 81.08 | 113.82 |
| 1996 | 113.48 | 129.60 |
| 1997 | 104.28 | 134.91 |
| 1998 | 106.99 | 132.74 |
| 1999 | 115.54 | 114.84 |
| 2000 | 114.20 | 104.34 |
| 2001 | 119.00 | 93.48 |
| 2002 | 109.28 | 92.83 |
| 2003 | 111.15 | 92.71 |
| 2004 | 115.67 | 103.06 |
| 2005 | 121.45 | 93.18 |
| 2006 | 85.30 | 78.08 |
| 2007 | 78.45 | 74.67 |
| 2008 | 73.94 | 71.79 |
| 2009 | 67.84 | 58.75 |
| 2010 | 76.84 | 62.68 |
|
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