|
| year | production | change |
| 1980 | 33.00 | NA |
| 1981 | 41.00 | 24.24 % |
| 1982 | 43.00 | 4.88 % |
| 1983 | 39.00 | -9.30 % |
| 1984 | 38.00 | -2.56 % |
| 1985 | 36.00 | -5.26 % |
| 1986 | 31.00 | -13.89 % |
| 1987 | 30.00 | -3.23 % |
| 1988 | 24.40 | -18.67 % |
| 1989 | 22.00 | -9.84 % |
| 1990 | 19.61 | -10.87 % |
| 1991 | 17.00 | -13.31 % |
| 1992 | 15.00 | -11.76 % |
| 1993 | 13.96 | -6.95 % |
| 1994 | 12.41 | -11.08 % |
| 1995 | 10.58 | -14.77 % |
| 1996 | 9.18 | -13.24 % |
| 1997 | 7.35 | -19.88 % |
| 1998 | 8.08 | 9.85 % |
| 1999 | 7.70 | -4.67 % |
| 2000 | 6.76 | -12.18 % |
| 2001 | 6.64 | -1.77 % |
| 2002 | | NA |
| 2003 | | NA |
| 2004 | 5.59 | NA |
| 2005 | 4.42 | -20.94 % |
| 2006 | 2.99 | -32.30 % |
| 2007 | 2.55 | -14.76 % |
| 2008 | 3.09 | 21.24 % |
| 2009 | 3.68 | 19.14 % |
| 2010 | 4.16 | 13.04 % |
| 2011 | 4.59 | 10.13 % |
| 2012 | 5.91 | 28.92 % |
|
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