|
| year | production | change |
| 1980 | 8.98 | NA |
| 1981 | 9.93 | 10.55 % |
| 1982 | 9.72 | -2.13 % |
| 1983 | 10.02 | 3.05 % |
| 1984 | 9.23 | -7.87 % |
| 1985 | 8.27 | -10.36 % |
| 1986 | 5.51 | -33.38 % |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | 2.20 | NA |
| 1992 | 1.10 | -50.00 % |
| 1993 | 2.20 | 100.00 % |
| 1994 | 6.61 | 200.00 % |
| 1995 | 6.61 | 0.00 % |
| 1996 | 8.82 | 33.33 % |
| 1997 | 17.64 | 100.00 % |
| 1998 | 12.13 | -31.25 % |
| 1999 | 19.84 | 63.64 % |
| 2000 | 18.74 | -5.56 % |
| 2001 | 11.02 | -41.18 % |
| 2002 | 13.23 | 20.00 % |
| 2003 | 12.13 | -8.33 % |
| 2004 | 9.92 | -18.18 % |
| 2005 | 13.23 | 33.33 % |
| 2006 | 22.05 | 66.67 % |
| 2007 | 15.43 | -30.00 % |
| 2008 | 16.53 | 7.14 % |
| 2009 | 16.53 | 0.00 % |
| 2010 | 17.64 | 6.67 % |
| 2011 | 17.64 | 0.00 % |
|
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