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| year | production | consumption |
| 1980 | .87 | 3.10 |
| 1981 | .92 | 3.08 |
| 1982 | 1.03 | 3.35 |
| 1983 | 1.13 | 3.44 |
| 1984 | 1.28 | 3.25 |
| 1985 | 1.33 | 3.33 |
| 1986 | 1.37 | 3.39 |
| 1987 | 1.36 | 3.49 |
| 1988 | 1.49 | 3.75 |
| 1989 | 1.44 | 3.86 |
| 1990 | 1.43 | 3.92 |
| 1991 | 1.44 | 4.15 |
| 1992 | 1.34 | 4.13 |
| 1993 | 1.34 | 4.02 |
| 1994 | 1.33 | 4.18 |
| 1995 | 1.19 | 4.30 |
| 1996 | 1.35 | 4.40 |
| 1997 | 1.28 | 4.70 |
| 1998 | 1.31 | 4.93 |
| 1999 | 1.26 | 5.17 |
| 2000 | 1.34 | 5.50 |
| 2001 | 1.51 | 5.76 |
| 2002 | 1.34 | 5.83 |
| 2003 | 1.51 | 6.14 |
| 2004 | 1.46 | 6.36 |
| 2005 | 1.30 | 6.53 |
| 2006 | 1.40 | 6.58 |
| 2007 | 1.39 | 6.76 |
| 2008 | 1.39 | 6.54 |
| 2009 | 1.42 | 6.12 |
| 2010 | 1.72 | 6.24 |
| 2011 | 1.54 | 6.07 |
| 2012 | 1.55 | 5.99 |
| 2013 | 1.66 | 5.66 |
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