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Loading...
| year | production | consumption |
| 1980 | 2.61 | 2.49 |
| 1981 | 2.90 | 2.81 |
| 1982 | 3.13 | 3.23 |
| 1983 | 3.28 | 3.25 |
| 1984 | 3.72 | 3.57 |
| 1985 | 3.98 | 3.56 |
| 1986 | 4.10 | 3.80 |
| 1987 | 4.07 | 3.82 |
| 1988 | 4.24 | 3.95 |
| 1989 | 4.12 | 3.59 |
| 1990 | 4.04 | 3.30 |
| 1991 | 4.12 | 3.68 |
| 1992 | 4.03 | 3.37 |
| 1993 | 4.40 | 3.87 |
| 1994 | 4.60 | 4.10 |
| 1995 | 4.84 | 4.17 |
| 1996 | 4.86 | 4.16 |
| 1997 | 5.40 | 4.46 |
| 1998 | 5.50 | 4.27 |
| 1999 | 5.51 | 4.63 |
| 2000 | 5.54 | 4.55 |
| 2001 | 5.53 | 4.60 |
| 2002 | 5.46 | 4.28 |
| 2003 | 5.90 | 4.74 |
| 2004 | 6.08 | 5.18 |
| 2005 | 6.05 | 5.08 |
| 2006 | 6.04 | 5.27 |
| 2007 | 6.05 | 5.45 |
| 2008 | 6.15 | 5.88 |
| 2009 | 6.07 | 5.48 |
| 2010 | 6.24 | 5.59 |
| 2011 | 6.15 | 5.83 |
| 2012 | 6.27 | 6.08 |
| 2013 | 5.93 | 5.77 |
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