|
| year | production | change |
| 1980 | 32.21 | NA |
| 1981 | 49.09 | 52.41 % |
| 1982 | 72.22 | 47.12 % |
| 1983 | 77.55 | 7.38 % |
| 1984 | 82.25 | 6.06 % |
| 1985 | 87.16 | 5.97 % |
| 1986 | 59.33 | -31.93 % |
| 1987 | 59.08 | -0.42 % |
| 1988 | 71.16 | 20.44 % |
| 1989 | 80.45 | 13.05 % |
| 1990 | 82.00 | 1.93 % |
| 1991 | 84.00 | 2.44 % |
| 1992 | 82.92 | -1.29 % |
| 1993 | 94.22 | 13.63 % |
| 1994 | 95.85 | 1.73 % |
| 1995 | 98.11 | 2.36 % |
| 1996 | 94.57 | -3.60 % |
| 1997 | 83.34 | -11.87 % |
| 1998 | 61.52 | -26.19 % |
| 1999 | 48.24 | -21.58 % |
| 2000 | 41.88 | -13.18 % |
| 2001 | 28.78 | -31.28 % |
| 2002 | 29.59 | 2.82 % |
| 2003 | 23.77 | -19.69 % |
| 2004 | 30.19 | 27.04 % |
| 2005 | 20.20 | -33.10 % |
| 2006 | 17.94 | -11.19 % |
| 2007 | 16.14 | -10.04 % |
| 2008 | 15.47 | -4.16 % |
| 2009 | 13.81 | -10.73 % |
| 2010 | 13.67 | -1.02 % |
| 2011 | 12.25 | -10.34 % |
|
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