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| year | production | consumption |
| 1980 | 5.90 | 5.50 |
| 1981 | 5.80 | 5.30 |
| 1982 | 8.30 | 7.70 |
| 1983 | 9.50 | 8.80 |
| 1984 | 10.00 | 9.40 |
| 1985 | 11.00 | 11.00 |
| 1986 | 12.00 | 11.00 |
| 1987 | 13.00 | 12.00 |
| 1988 | 14.00 | 13.00 |
| 1989 | 15.00 | 13.00 |
| 1990 | 16.00 | 15.00 |
| 1991 | 16.00 | 15.00 |
| 1992 | 16.00 | 15.00 |
| 1993 | 17.00 | 15.00 |
| 1994 | 18.00 | 16.00 |
| 1995 | 23.00 | 21.00 |
| 1996 | 25.00 | 23.00 |
| 1997 | 27.00 | 25.00 |
| 1998 | 31.00 | 30.00 |
| 1999 | 35.00 | 34.00 |
| 2000 | 38.00 | 36.00 |
| 2001 | 41.00 | 37.00 |
| 2002 | 44.00 | 41.00 |
| 2003 | 46.00 | 43.00 |
| 2004 | 49.00 | 46.00 |
| 2005 | 57.00 | 53.00 |
| 2006 | 63.00 | 58.00 |
| 2007 | 74.00 | 69.00 |
| 2008 | 77.00 | 71.00 |
| 2009 | 83.00 | 76.00 |
| 2010 | 88.00 | 81.00 |
| 2011 | 93.00 | 86.00 |
| 2012 | 101.00 | 93.00 |
| 2013 | 105.00 | 97.00 |
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