|
| year | production | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | 2.40 | NA |
| 1984 | 7.66 | 219.12 % |
| 1985 | 8.79 | 14.70 % |
| 1986 | 13.00 | 47.90 % |
| 1987 | 25.00 | 92.31 % |
| 1988 | 31.00 | 24.00 % |
| 1989 | 55.00 | 77.42 % |
| 1990 | 49.00 | -10.91 % |
| 1991 | 46.00 | -6.12 % |
| 1992 | 42.13 | -8.41 % |
| 1993 | 22.71 | -46.10 % |
| 1994 | 6.89 | -69.67 % |
| 1995 | 14.66 | 112.88 % |
| 1996 | 16.46 | 12.26 % |
| 1997 | 6.29 | -61.80 % |
| 1998 | 3.96 | -37.08 % |
| 1999 | 5.05 | 27.68 % |
| 2000 | 5.72 | 13.29 % |
| 2001 | 18.22 | 218.52 % |
| 2002 | 18.05 | -0.97 % |
| 2003 | 7.59 | -57.93 % |
| 2004 | 11.97 | 57.67 % |
| 2005 | 5.58 | -53.39 % |
| 2006 | 2.44 | -56.33 % |
| 2007 | .64 | -73.91 % |
| 2008 | .60 | -5.55 % |
| 2009 | .49 | -17.65 % |
| 2010 | 2.01 | 307.14 % |
| 2011 | 1.84 | -8.77 % |
|
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