|
| year | production | change |
| 1980 | 2.72 | NA |
| 1981 | 3.07 | 13.00 % |
| 1982 | 3.17 | 3.42 % |
| 1983 | 3.28 | 3.41 % |
| 1984 | 3.72 | 13.24 % |
| 1985 | 3.98 | 7.09 % |
| 1986 | 4.10 | 2.97 % |
| 1987 | 4.07 | -0.70 % |
| 1988 | 4.23 | 4.08 % |
| 1989 | 4.12 | -2.68 % |
| 1990 | 4.05 | -1.84 % |
| 1991 | 4.12 | 1.83 % |
| 1992 | 4.21 | 2.30 % |
| 1993 | 4.30 | 2.13 % |
| 1994 | 4.60 | 6.82 % |
| 1995 | 4.84 | 5.28 % |
| 1996 | 4.86 | 0.31 % |
| 1997 | 5.44 | 11.99 % |
| 1998 | 5.52 | 1.60 % |
| 1999 | 5.43 | -1.63 % |
| 2000 | 5.58 | 2.65 % |
| 2001 | 5.62 | 0.72 % |
| 2002 | 5.52 | -1.73 % |
| 2003 | 5.91 | 7.12 % |
| 2004 | 6.06 | 2.55 % |
| 2005 | 6.05 | -0.20 % |
| 2006 | 6.04 | -0.23 % |
| 2007 | 6.04 | 0.10 % |
| 2008 | 6.14 | 1.57 % |
| 2009 | 6.06 | -1.27 % |
| 2010 | 6.18 | 1.96 % |
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