|
| year | production | change |
| 1980 | 11.40 | NA |
| 1981 | 11.51 | 1.02 % |
| 1982 | 11.45 | -0.55 % |
| 1983 | 11.70 | 2.15 % |
| 1984 | 12.55 | 7.31 % |
| 1985 | 12.83 | 2.22 % |
| 1986 | 13.72 | 6.94 % |
| 1987 | 13.65 | -0.52 % |
| 1988 | 14.52 | 6.40 % |
| 1989 | 15.11 | 4.03 % |
| 1990 | 15.96 | 5.67 % |
| 1991 | 16.82 | 5.38 % |
| 1992 | 17.14 | 1.87 % |
| 1993 | 18.01 | 5.08 % |
| 1994 | 18.97 | 5.33 % |
| 1995 | 20.27 | 6.88 % |
| 1996 | 21.56 | 6.36 % |
| 1997 | 23.14 | 7.33 % |
| 1998 | 23.79 | 2.81 % |
| 1999 | 23.35 | -1.87 % |
| 2000 | 24.78 | 6.12 % |
| 2001 | 24.70 | -0.32 % |
| 2002 | 23.93 | -3.13 % |
| 2003 | 23.99 | 0.25 % |
| 2004 | 25.25 | 5.27 % |
| 2005 | 26.13 | 3.50 % |
| 2006 | 26.93 | 3.04 % |
| 2007 | 26.80 | -0.48 % |
| 2008 | 27.34 | 2.01 % |
| 2009 | 27.12 | -0.79 % |
| 2010 | 28.03 | 3.36 % |
|
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