|
| year | production | consumption |
| 1980 | 152.12 | 281.09 |
| 1981 | 154.32 | 289.91 |
| 1982 | 135.58 | 273.37 |
| 1983 | 124.56 | 262.35 |
| 1984 | 133.38 | 265.66 |
| 1985 | 133.38 | 268.96 |
| 1986 | 131.18 | 277.78 |
| 1987 | 134.48 | 282.19 |
| 1988 | 165.35 | 315.26 |
| 1989 | 121.25 | 275.58 |
| 1990 | 85.98 | 241.41 |
| 1991 | 88.18 | 251.33 |
| 1992 | 93.70 | 255.74 |
| 1993 | 101.41 | 263.45 |
| 1994 | 103.62 | 267.86 |
| 1995 | 104.72 | 320.77 |
| 1996 | 104.72 | 273.37 |
| 1997 | 102.52 | 273.37 |
| 1998 | 105.82 | 276.68 |
| 1999 | 105.82 | 276.68 |
| 2000 | 105.82 | 256.84 |
| 2001 | 109.13 | 251.33 |
| 2002 | 112.44 | 259.04 |
| 2003 | 115.74 | 274.48 |
| 2004 | 119.05 | 292.11 |
| 2005 | 132.28 | 310.85 |
| 2006 | 135.58 | 326.28 |
| 2007 | 139.99 | 347.23 |
| 2008 | 144.40 | 368.17 |
| 2009 | 148.81 | 378.09 |
| 2010 | 153.22 | 405.65 |
| 2011 | 145.51 | 397.93 |
|
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