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Loading...
| year | production | consumption |
| 1980 | 33.78 | 57.72 |
| 1981 | 34.32 | 54.82 |
| 1982 | 35.71 | 55.26 |
| 1983 | 37.76 | 55.55 |
| 1984 | 37.91 | 56.99 |
| 1985 | 40.38 | 58.92 |
| 1986 | 41.47 | 60.22 |
| 1987 | 41.95 | 61.67 |
| 1988 | 42.11 | 62.36 |
| 1989 | 41.32 | 62.66 |
| 1990 | 39.99 | 61.68 |
| 1991 | 44.93 | 73.38 |
| 1992 | 97.44 | 117.95 |
| 1993 | 95.80 | 117.75 |
| 1994 | 94.10 | 113.28 |
| 1995 | 94.35 | 113.45 |
| 1996 | 95.06 | 113.51 |
| 1997 | 93.59 | 111.67 |
| 1998 | 92.91 | 112.07 |
| 1999 | 94.97 | 112.91 |
| 2000 | 95.67 | 114.72 |
| 2001 | 97.48 | 115.60 |
| 2002 | 98.59 | 116.29 |
| 2003 | 100.97 | 118.75 |
| 2004 | 103.73 | 121.25 |
| 2005 | 103.20 | 121.59 |
| 2006 | 103.00 | 122.82 |
| 2007 | 102.44 | 122.71 |
| 2008 | 102.58 | 123.21 |
| 2009 | 98.18 | 113.69 |
| 2010 | 102.49 | 121.33 |
| 2011 | 101.88 | 120.97 |
| 2012 | 102.81 | 121.12 |
| 2013 | 99.66 | 119.11 |
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