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Loading...
| year | production | consumption |
| 1980 | 3.14 | 3.97 |
| 1981 | 3.67 | 4.45 |
| 1982 | 3.96 | 4.61 |
| 1983 | 4.34 | 4.88 |
| 1984 | 4.68 | 5.27 |
| 1985 | 5.01 | 5.54 |
| 1986 | 5.38 | 5.96 |
| 1987 | 5.57 | 6.28 |
| 1988 | 6.15 | 6.92 |
| 1989 | 6.42 | 7.31 |
| 1990 | 6.83 | 7.80 |
| 1991 | 7.17 | 8.24 |
| 1992 | 7.37 | 8.76 |
| 1993 | 7.50 | 9.19 |
| 1994 | 7.98 | 9.88 |
| 1995 | 9.48 | 11.38 |
| 1996 | 9.19 | 11.32 |
| 1997 | 9.41 | 11.69 |
| 1998 | 9.46 | 12.09 |
| 1999 | 9.60 | 12.83 |
| 2000 | 9.83 | 13.29 |
| 2001 | 10.24 | 13.74 |
| 2002 | 10.08 | 13.76 |
| 2003 | 10.65 | 14.22 |
| 2004 | 11.24 | 15.43 |
| 2005 | 11.94 | 16.59 |
| 2006 | 12.61 | 17.74 |
| 2007 | 13.26 | 19.15 |
| 2008 | 13.87 | 20.11 |
| 2009 | 14.93 | 22.18 |
| 2010 | 15.71 | 23.70 |
| 2011 | 16.15 | 23.31 |
| 2012 | 16.18 | 24.44 |
| 2013 | 14.90 | 25.43 |
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