|
| year | production | change |
| 1980 | 17.40 | NA |
| 1981 | 15.19 | -12.68 % |
| 1982 | 15.48 | 1.88 % |
| 1983 | 16.12 | 4.14 % |
| 1984 | 17.55 | 8.90 % |
| 1985 | 18.39 | 4.79 % |
| 1986 | 18.45 | 0.32 % |
| 1987 | 18.62 | 0.92 % |
| 1988 | 19.71 | 5.89 % |
| 1989 | 20.59 | 4.43 % |
| 1990 | 21.63 | 5.08 % |
| 1991 | 22.49 | 3.97 % |
| 1992 | 22.84 | 1.54 % |
| 1993 | 22.64 | -0.85 % |
| 1994 | 22.82 | 0.79 % |
| 1995 | 24.00 | 5.16 % |
| 1996 | 24.61 | 2.54 % |
| 1997 | 26.06 | 5.89 % |
| 1998 | 26.27 | 0.81 % |
| 1999 | 26.58 | 1.16 % |
| 2000 | 27.70 | 4.21 % |
| 2001 | 27.97 | 1.00 % |
| 2002 | 28.11 | 0.50 % |
| 2003 | 29.95 | 6.54 % |
| 2004 | 31.80 | 6.19 % |
| 2005 | 34.29 | 7.81 % |
| 2006 | 34.81 | 1.52 % |
| 2007 | 35.70 | 2.55 % |
| 2008 | 36.77 | 3.00 % |
| 2009 | 36.10 | -1.83 % |
| 2010 | 37.15 | 2.92 % |
|
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