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| year | production | consumption |
| 1980 | .87 | 2.07 |
| 1981 | .99 | 2.02 |
| 1982 | .95 | 1.88 |
| 1983 | 1.07 | 1.92 |
| 1984 | 1.21 | 2.03 |
| 1985 | 1.31 | 2.16 |
| 1986 | 1.32 | 2.19 |
| 1987 | 1.40 | 2.26 |
| 1988 | 1.39 | 2.22 |
| 1989 | 1.39 | 2.19 |
| 1990 | 1.42 | 2.21 |
| 1991 | 1.41 | 2.21 |
| 1992 | 1.39 | 2.24 |
| 1993 | 1.37 | 2.24 |
| 1994 | 1.33 | 2.26 |
| 1995 | 1.39 | 2.30 |
| 1996 | 1.27 | 2.26 |
| 1997 | 1.40 | 2.31 |
| 1998 | 1.50 | 2.39 |
| 1999 | 1.46 | 2.35 |
| 2000 | 1.39 | 2.26 |
| 2001 | 1.55 | 2.39 |
| 2002 | 1.37 | 2.26 |
| 2003 | 1.24 | 2.14 |
| 2004 | 1.44 | 2.31 |
| 2005 | 1.52 | 2.33 |
| 2006 | 1.37 | 2.21 |
| 2007 | 1.42 | 2.24 |
| 2008 | 1.41 | 2.18 |
| 2009 | 1.28 | 2.06 |
| 2010 | 1.36 | 2.18 |
| 2011 | 1.40 | 2.14 |
| 2012 | 1.55 | 2.22 |
| 2013 | 1.43 | 2.12 |
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