|
| year | production | change |
| 1984 | 2.44 | NA |
| 1985 | 2.86 | 17.23 % |
| 1986 | 2.03 | -28.93 % |
| 1987 | 2.38 | 17.25 % |
| 1988 | 1.43 | -40.16 % |
| 1989 | 1.27 | -10.87 % |
| 1990 | 1.47 | 15.30 % |
| 1991 | 1.33 | -9.16 % |
| 1992 | .57 | -56.91 % |
| 1993 | .64 | 11.73 % |
| 1994 | 1.08 | 68.80 % |
| 1995 | 1.91 | 76.71 % |
| 1996 | .64 | -66.71 % |
| 1997 | 1.40 | 119.48 % |
| 1998 | .92 | -34.31 % |
| 1999 | .57 | -37.61 % |
| 2000 | 1.17 | 104.70 % |
| 2001 | .13 | -89.01 % |
| 2002 | .86 | 565.94 % |
| 2003 | 1.58 | 84.67 % |
| 2004 | 1.81 | 14.05 % |
| 2005 | 3.44 | 90.23 % |
| 2006 | 1.63 | -52.63 % |
| 2007 | 2.26 | 38.72 % |
| 2008 | 3.11 | 37.61 % |
| 2009 | 2.89 | -6.87 % |
| 2010 | 2.76 | -4.55 % |
|
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