|
| year | production | change |
| 1980 | 2.33 | NA |
| 1981 | 2.66 | 14.09 % |
| 1982 | 2.63 | -1.28 % |
| 1983 | 2.97 | 12.90 % |
| 1984 | 3.37 | 13.67 % |
| 1985 | 3.55 | 5.25 % |
| 1986 | 3.80 | 7.17 % |
| 1987 | 3.96 | 4.07 % |
| 1988 | 4.05 | 2.31 % |
| 1989 | 4.04 | -0.27 % |
| 1990 | 4.25 | 5.16 % |
| 1991 | 4.45 | 4.77 % |
| 1992 | 4.61 | 3.69 % |
| 1993 | 4.84 | 4.88 % |
| 1994 | 4.86 | 0.53 % |
| 1995 | 4.94 | 1.59 % |
| 1996 | 5.03 | 1.76 % |
| 1997 | 4.92 | -2.08 % |
| 1998 | 4.78 | -2.99 % |
| 1999 | 4.92 | 3.03 % |
| 2000 | 5.02 | 2.10 % |
| 2001 | 5.15 | 2.41 % |
| 2002 | 5.13 | -0.30 % |
| 2003 | 5.15 | 0.44 % |
| 2004 | 5.17 | 0.32 % |
| 2005 | 5.10 | -1.30 % |
| 2006 | 5.14 | 0.75 % |
| 2007 | 5.07 | -1.39 % |
| 2008 | 5.13 | 1.25 % |
| 2009 | 4.79 | -6.63 % |
| 2010 | 5.07 | 5.76 % |
|
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