|
| year | production | change |
| 1980 | 44.00 | NA |
| 1981 | 44.00 | 0.00 % |
| 1982 | 64.00 | 45.45 % |
| 1983 | 75.00 | 17.19 % |
| 1984 | 55.00 | -26.67 % |
| 1985 | 55.00 | 0.00 % |
| 1986 | 55.00 | 0.00 % |
| 1987 | 54.00 | -1.82 % |
| 1988 | 44.00 | -18.52 % |
| 1989 | 47.00 | 6.82 % |
| 1990 | 30.00 | -36.17 % |
| 1991 | 18.86 | -37.13 % |
| 1992 | 10.52 | -44.21 % |
| 1993 | 11.26 | 7.01 % |
| 1994 | 11.50 | 2.13 % |
| 1995 | 10.00 | -13.04 % |
| 1996 | 9.50 | -5.00 % |
| 1997 | 9.22 | -3.00 % |
| 1998 | 6.30 | -31.63 % |
| 1999 | 5.58 | -11.50 % |
| 2000 | 5.66 | 1.45 % |
| 2001 | 5.95 | 5.23 % |
| 2002 | 6.36 | 6.87 % |
| 2003 | 6.72 | 5.60 % |
| 2004 | 6.69 | -0.36 % |
| 2005 | | NA |
| 2006 | 7.74 | NA |
| 2007 | 6.42 | -17.09 % |
| 2008 | | NA |
| 2009 | 5.33 | NA |
| 2010 | 10.84 | 103.50 % |
| 2011 | 15.52 | 43.08 % |
| 2012 | 16.84 | 8.51 % |
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