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| year | production | consumption |
| 1980 | 4.23 | 1.16 |
| 1981 | 4.34 | 1.26 |
| 1982 | 3.71 | 1.30 |
| 1983 | 3.85 | 1.38 |
| 1984 | 4.30 | 1.45 |
| 1985 | 4.20 | 1.52 |
| 1986 | 4.40 | 1.60 |
| 1987 | 4.39 | 1.68 |
| 1988 | 4.57 | 1.79 |
| 1989 | 4.98 | 2.03 |
| 1990 | 5.30 | 2.25 |
| 1991 | 5.90 | 2.45 |
| 1992 | 6.08 | 2.57 |
| 1993 | 6.32 | 2.97 |
| 1994 | 6.65 | 3.04 |
| 1995 | 6.95 | 3.27 |
| 1996 | 7.43 | 3.66 |
| 1997 | 7.41 | 3.55 |
| 1998 | 7.41 | 3.31 |
| 1999 | 7.67 | 3.64 |
| 2000 | 7.44 | 3.88 |
| 2001 | 6.99 | 3.88 |
| 2002 | 7.85 | 4.12 |
| 2003 | 7.99 | 3.90 |
| 2004 | 8.08 | 4.49 |
| 2005 | 8.47 | 4.60 |
| 2006 | 8.88 | 5.01 |
| 2007 | 9.70 | 5.21 |
| 2008 | 9.59 | 5.30 |
| 2009 | 10.95 | 5.98 |
| 2010 | 13.78 | 6.44 |
| 2011 | 15.80 | 5.87 |
| 2012 | 16.96 | 6.38 |
| 2013 | 16.00 | 6.35 |
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