|
| year | production | change |
| 1980 | 3.89 | NA |
| 1981 | 3.45 | -11.16 % |
| 1982 | 3.00 | -13.17 % |
| 1983 | 2.91 | -3.02 % |
| 1984 | 3.00 | 3.26 % |
| 1985 | 3.29 | 9.60 % |
| 1986 | 3.68 | 11.73 % |
| 1987 | 4.21 | 14.45 % |
| 1988 | 4.22 | 0.30 % |
| 1989 | 4.99 | 18.29 % |
| 1990 | 5.51 | 10.38 % |
| 1991 | 6.24 | 13.21 % |
| 1992 | 6.11 | -2.09 % |
| 1993 | 5.78 | -5.35 % |
| 1994 | 5.84 | 0.90 % |
| 1995 | 6.14 | 5.22 % |
| 1996 | 6.34 | 3.26 % |
| 1997 | 6.50 | 2.54 % |
| 1998 | 6.61 | 1.63 % |
| 1999 | 6.25 | -5.35 % |
| 2000 | 6.77 | 8.21 % |
| 2001 | 6.59 | -2.56 % |
| 2002 | 6.50 | -1.43 % |
| 2003 | 7.13 | 9.70 % |
| 2004 | 7.42 | 4.14 % |
| 2005 | 7.59 | 2.23 % |
| 2006 | 7.87 | 3.67 % |
| 2007 | 7.91 | 0.59 % |
| 2008 | 8.13 | 2.69 % |
| 2009 | 7.52 | -7.50 % |
| 2010 | 7.64 | 1.62 % |
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