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Loading...
| year | production | consumption |
| 1980 | 3.25 | 2.76 |
| 1981 | 3.72 | 2.75 |
| 1982 | 3.74 | 2.92 |
| 1983 | 4.14 | 2.88 |
| 1984 | 4.54 | 3.08 |
| 1985 | 5.00 | 3.19 |
| 1986 | 5.20 | 3.22 |
| 1987 | 5.72 | 3.36 |
| 1988 | 5.28 | 3.48 |
| 1989 | 5.57 | 3.65 |
| 1990 | 6.16 | 3.73 |
| 1991 | 6.44 | 3.72 |
| 1992 | 6.63 | 3.82 |
| 1993 | 6.65 | 3.93 |
| 1994 | 6.92 | 3.93 |
| 1995 | 7.43 | 4.05 |
| 1996 | 7.58 | 4.22 |
| 1997 | 8.31 | 4.56 |
| 1998 | 8.66 | 4.59 |
| 1999 | 8.85 | 4.81 |
| 2000 | 9.66 | 4.84 |
| 2001 | 10.25 | 5.01 |
| 2002 | 10.46 | 5.10 |
| 2003 | 10.31 | 5.29 |
| 2004 | 10.46 | 5.47 |
| 2005 | 10.97 | 5.73 |
| 2006 | 11.10 | 5.79 |
| 2007 | 11.69 | 5.93 |
| 2008 | 11.78 | 5.99 |
| 2009 | 12.19 | 6.00 |
| 2010 | 13.06 | 5.89 |
| 2011 | 12.06 | 5.91 |
| 2012 | 11.67 | 5.80 |
| 2013 | 8.90 | 5.74 |
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