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Loading...
| year | production | consumption |
| 1980 | 18.12 | 17.94 |
| 1981 | 17.95 | 17.78 |
| 1982 | 18.92 | 18.39 |
| 1983 | 20.24 | 19.52 |
| 1984 | 22.13 | 20.98 |
| 1985 | 24.30 | 22.01 |
| 1986 | 25.04 | 22.81 |
| 1987 | 25.94 | 24.13 |
| 1988 | 27.15 | 25.79 |
| 1989 | 28.78 | 25.81 |
| 1990 | 29.37 | 28.29 |
| 1991 | 29.62 | 26.39 |
| 1992 | 30.33 | 27.47 |
| 1993 | 31.32 | 29.59 |
| 1994 | 33.29 | 31.88 |
| 1995 | 34.88 | 34.44 |
| 1996 | 36.78 | 35.75 |
| 1997 | 36.09 | 34.85 |
| 1998 | 35.78 | 35.32 |
| 1999 | 35.51 | 37.00 |
| 2000 | 38.47 | 41.11 |
| 2001 | 40.95 | 43.51 |
| 2002 | 43.38 | 47.12 |
| 2003 | 49.35 | 54.33 |
| 2004 | 56.91 | 63.45 |
| 2005 | 63.28 | 72.65 |
| 2006 | 67.56 | 79.36 |
| 2007 | 73.03 | 85.97 |
| 2008 | 76.76 | 88.89 |
| 2009 | 79.32 | 93.63 |
| 2010 | 86.53 | 99.73 |
| 2011 | 94.56 | 108.24 |
| 2012 | 97.33 | 113.04 |
| 2013 | 99.88 | 116.72 |
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