|
| year | production | change |
| 1980 | 317.47 | NA |
| 1981 | 451.95 | 42.36 % |
| 1982 | 485.02 | 7.32 % |
| 1983 | 555.56 | 14.55 % |
| 1984 | 497.14 | -10.52 % |
| 1985 | 558.87 | 12.42 % |
| 1986 | 481.71 | -13.81 % |
| 1987 | 439.82 | -8.70 % |
| 1988 | 291.01 | -33.83 % |
| 1989 | 396.83 | 36.36 % |
| 1990 | 334.00 | -15.83 % |
| 1991 | 363.76 | 8.91 % |
| 1992 | 395.73 | 8.79 % |
| 1993 | 295.42 | -25.35 % |
| 1994 | 331.80 | 12.31 % |
| 1995 | 321.87 | -2.99 % |
| 1996 | 253.53 | -21.23 % |
| 1997 | 425.49 | 67.83 % |
| 1998 | 361.56 | -15.03 % |
| 1999 | 445.33 | 23.17 % |
| 2000 | 696.66 | 56.44 % |
| 2001 | 1,970.93 | 182.91 % |
| 2002 | 2,350.13 | 19.24 % |
| 2003 | 3,245.21 | 38.09 % |
| 2004 | 3,201.11 | -1.36 % |
| 2005 | 1,621.50 | -49.35 % |
| 2006 | 2,640.04 | 62.81 % |
| 2007 | 4,489.71 | 70.06 % |
| 2008 | 3,780.93 | -15.79 % |
| 2009 | 2,911.20 | -23.00 % |
| 2010 | 2,132.97 | -26.73 % |
| 2011 | 1,527.80 | -28.37 % |
|
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