|
| year | production | change |
| 1980 | 46.30 | NA |
| 1981 | 54.01 | 16.67 % |
| 1982 | 56.22 | 4.08 % |
| 1983 | 40.79 | -27.45 % |
| 1984 | 56.22 | 37.84 % |
| 1985 | 46.30 | -17.65 % |
| 1986 | 62.83 | 35.71 % |
| 1987 | 68.34 | 8.77 % |
| 1988 | 1,201.52 | 1,658.07 % |
| 1989 | 2,342.41 | 94.95 % |
| 1990 | 2,413.47 | 3.03 % |
| 1991 | 2,397.84 | -0.65 % |
| 1992 | 2,700.35 | 12.62 % |
| 1993 | 4,205.25 | 55.73 % |
| 1994 | 4,715.37 | 12.13 % |
| 1995 | 4,480.05 | -4.99 % |
| 1996 | 4,010.91 | -10.47 % |
| 1997 | 5,672.53 | 41.43 % |
| 1998 | 8,218.83 | 44.89 % |
| 1999 | 7,693.16 | -6.40 % |
| 2000 | 8,691.34 | 12.97 % |
| 2001 | 8,361.41 | -3.80 % |
| 2002 | 8,122.77 | -2.85 % |
| 2003 | 7,503.43 | -7.62 % |
| 2004 | 7,438.40 | -0.87 % |
| 2005 | 7,930.58 | 6.62 % |
| 2006 | 8,678.43 | 9.43 % |
| 2007 | 6,720.42 | -22.56 % |
| 2008 | 5,425.90 | -19.26 % |
| 2009 | 3,617.52 | -33.33 % |
| 2010 | 3,009.31 | -16.81 % |
| 2011 | 2,503.35 | -16.81 % |
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