|
| year | production | change |
| 1980 | 3.16 | NA |
| 1981 | 2.94 | -6.94 % |
| 1982 | 2.54 | -13.55 % |
| 1983 | 2.72 | 7.31 % |
| 1984 | 2.76 | 1.42 % |
| 1985 | 2.92 | 5.72 % |
| 1986 | 2.74 | -6.18 % |
| 1987 | 2.73 | -0.39 % |
| 1988 | 2.42 | -11.26 % |
| 1989 | 2.60 | 7.50 % |
| 1990 | 2.64 | 1.18 % |
| 1991 | 2.95 | 11.98 % |
| 1992 | 2.93 | -0.80 % |
| 1993 | 2.98 | 1.70 % |
| 1994 | 2.91 | -2.15 % |
| 1995 | 2.91 | -0.20 % |
| 1996 | 3.25 | 11.73 % |
| 1997 | 2.88 | -11.31 % |
| 1998 | 2.77 | -3.86 % |
| 1999 | 2.56 | -7.73 % |
| 2000 | 2.47 | -3.23 % |
| 2001 | 2.63 | 6.35 % |
| 2002 | 2.62 | -0.54 % |
| 2003 | 2.53 | -3.38 % |
| 2004 | 2.94 | 16.36 % |
| 2005 | 2.70 | -8.04 % |
| 2006 | 2.65 | -1.93 % |
| 2007 | 2.65 | -0.23 % |
| 2008 | 2.89 | 9.03 % |
| 2009 | 2.72 | -5.58 % |
| 2010 | 3.02 | 10.97 % |
|
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