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Loading...
| year | production | consumption |
| 1980 | 41.79 | 37.76 |
| 1981 | 43.71 | 39.38 |
| 1982 | 42.33 | 37.40 |
| 1983 | 44.46 | 38.93 |
| 1984 | 47.60 | 41.37 |
| 1985 | 46.61 | 41.28 |
| 1986 | 49.63 | 44.21 |
| 1987 | 52.76 | 46.03 |
| 1988 | 55.39 | 48.96 |
| 1989 | 55.31 | 48.48 |
| 1990 | 55.65 | 49.22 |
| 1991 | 55.58 | 48.35 |
| 1992 | 57.29 | 48.96 |
| 1993 | 61.49 | 53.46 |
| 1994 | 63.91 | 55.08 |
| 1995 | 67.87 | 57.73 |
| 1996 | 72.67 | 62.14 |
| 1997 | 76.41 | 64.77 |
| 1998 | 78.13 | 67.20 |
| 1999 | 83.96 | 72.32 |
| 2000 | 88.38 | 75.95 |
| 2001 | 91.09 | 80.56 |
| 2002 | 97.42 | 83.09 |
| 2003 | 103.24 | 88.52 |
| 2004 | 101.64 | 86.63 |
| 2005 | 106.79 | 94.08 |
| 2006 | 111.00 | 96.59 |
| 2007 | 112.20 | 99.09 |
| 2008 | 108.11 | 93.50 |
| 2009 | 109.41 | 94.40 |
| 2010 | 110.32 | 96.51 |
| 2011 | 113.52 | 98.71 |
| 2012 | 116.92 | 101.61 |
| 2013 | 118.02 | 103.21 |
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