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Loading...
| year | production | consumption |
| 1980 | .34 | .06 |
| 1981 | .29 | .06 |
| 1982 | .28 | .06 |
| 1983 | .40 | .07 |
| 1984 | .46 | .06 |
| 1985 | .51 | .07 |
| 1986 | .62 | .07 |
| 1987 | .79 | .08 |
| 1988 | .99 | .08 |
| 1989 | .99 | .08 |
| 1990 | 1.04 | .08 |
| 1991 | 1.09 | .08 |
| 1992 | 1.15 | .09 |
| 1993 | 1.11 | .08 |
| 1994 | 1.17 | .08 |
| 1995 | 1.40 | .09 |
| 1996 | 1.54 | .08 |
| 1997 | 1.55 | .09 |
| 1998 | 1.60 | .09 |
| 1999 | 1.62 | .09 |
| 2000 | 1.62 | .09 |
| 2001 | 1.61 | .12 |
| 2002 | 1.94 | .13 |
| 2003 | 1.96 | .14 |
| 2004 | 2.29 | .15 |
| 2005 | 2.70 | .15 |
| 2006 | 3.06 | .17 |
| 2007 | 3.76 | .19 |
| 2008 | 4.22 | .22 |
| 2009 | 4.04 | .26 |
| 2010 | 4.12 | .28 |
| 2011 | 3.79 | .29 |
| 2012 | 3.87 | .30 |
| 2013 | 3.99 | .33 |
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