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Loading...
| year | production | consumption |
| 1980 | 17.27 | 6.44 |
| 1981 | 15.00 | 6.72 |
| 1982 | 15.42 | 7.54 |
| 1983 | 16.09 | 7.86 |
| 1984 | 17.53 | 8.33 |
| 1985 | 18.38 | 8.45 |
| 1986 | 18.42 | 8.82 |
| 1987 | 18.60 | 9.02 |
| 1988 | 19.69 | 9.38 |
| 1989 | 20.58 | 9.22 |
| 1990 | 21.62 | 9.14 |
| 1991 | 22.48 | 9.73 |
| 1992 | 22.65 | 9.42 |
| 1993 | 22.72 | 9.96 |
| 1994 | 22.81 | 10.28 |
| 1995 | 23.99 | 10.58 |
| 1996 | 24.59 | 10.79 |
| 1997 | 26.00 | 11.19 |
| 1998 | 26.21 | 11.08 |
| 1999 | 26.50 | 11.66 |
| 2000 | 27.30 | 11.85 |
| 2001 | 27.47 | 12.40 |
| 2002 | 27.59 | 12.26 |
| 2003 | 29.41 | 12.99 |
| 2004 | 31.21 | 13.67 |
| 2005 | 33.66 | 14.26 |
| 2006 | 34.10 | 14.37 |
| 2007 | 34.79 | 14.70 |
| 2008 | 35.78 | 15.96 |
| 2009 | 35.04 | 15.73 |
| 2010 | 36.10 | 16.21 |
| 2011 | 32.94 | 16.55 |
| 2012 | 35.82 | 17.78 |
| 2013 | 33.40 | 17.51 |
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