|
| year | production | change |
| 1980 | 4.79 | NA |
| 1981 | 4.08 | -14.68 % |
| 1982 | 4.66 | 14.04 % |
| 1983 | 4.73 | 1.50 % |
| 1984 | 4.80 | 1.63 % |
| 1985 | 4.87 | 1.28 % |
| 1986 | 4.92 | 1.11 % |
| 1987 | 4.98 | 1.19 % |
| 1988 | 4.97 | -0.10 % |
| 1989 | 4.60 | -7.40 % |
| 1990 | 3.86 | -16.16 % |
| 1991 | 3.72 | -3.58 % |
| 1992 | 3.66 | -1.70 % |
| 1993 | 3.67 | 0.34 % |
| 1994 | 3.72 | 1.42 % |
| 1995 | 3.59 | -3.63 % |
| 1996 | 3.83 | 6.68 % |
| 1997 | 3.83 | 0.14 % |
| 1998 | 3.36 | -12.44 % |
| 1999 | 3.50 | 4.37 % |
| 2000 | 3.06 | -12.75 % |
| 2001 | 3.07 | 0.57 % |
| 2002 | 3.08 | 0.11 % |
| 2003 | 3.06 | -0.67 % |
| 2004 | 3.04 | -0.66 % |
| 2005 | 2.97 | -2.32 % |
| 2006 | 2.90 | -2.29 % |
| 2007 | 2.72 | -6.10 % |
| 2008 | 2.66 | -2.32 % |
| 2009 | 2.51 | -5.50 % |
| 2010 | 2.50 | -0.45 % |
|
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