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| year | production | change |
| 1980 | .05 | NA |
| 1981 | .06 | 14.81% |
| 1982 | .07 | 9.68% |
| 1983 | .07 | 5.88% |
| 1984 | .10 | 38.89% |
| 1985 | .10 | 3.00% |
| 1986 | .11 | 8.74% |
| 1987 | .13 | 16.07% |
| 1988 | .15 | 15.38% |
| 1989 | .17 | 10.00% |
| 1990 | .16 | -0.61% |
| 1991 | .17 | 5.49% |
| 1992 | .20 | 17.92% |
| 1993 | .22 | 8.82% |
| 1994 | .24 | 9.91% |
| 1995 | .26 | 8.20% |
| 1996 | .27 | 3.03% |
| 1997 | .28 | 1.10% |
| 1998 | .30 | 7.64% |
| 1999 | .33 | 9.80% |
| 2000 | .35 | 8.00% |
| 2001 | .37 | 6.55% |
| 2002 | .41 | 9.09% |
| 2003 | .46 | 12.01% |
| 2004 | .50 | 8.75% |
| 2005 | .54 | 8.05% |
| 2006 | .59 | 10.61% |
| 2007 | .62 | 5.05% |
| 2008 | .69 | 10.74% |
| 2009 | .75 | 8.54% |
| 2010 | .76 | 1.60% |
| 2011 | .77 | 1.05% |
| 2012 | .84 | 9.48% |
| 2013 | .87 | 3.32% |
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