|
| year | production | change |
| 1980 | 4.23 | NA |
| 1981 | 4.33 | 2.55 % |
| 1982 | 3.71 | -14.41 % |
| 1983 | 3.85 | 3.76 % |
| 1984 | 4.29 | 11.56 % |
| 1985 | 4.20 | -2.29 % |
| 1986 | 4.40 | 4.79 % |
| 1987 | 4.39 | -0.07 % |
| 1988 | 4.57 | 3.98 % |
| 1989 | 4.98 | 9.00 % |
| 1990 | 5.30 | 6.46 % |
| 1991 | 5.90 | 11.23 % |
| 1992 | 6.08 | 3.13 % |
| 1993 | 6.32 | 3.83 % |
| 1994 | 6.65 | 5.33 % |
| 1995 | 6.95 | 4.48 % |
| 1996 | 7.43 | 6.93 % |
| 1997 | 7.39 | -0.61 % |
| 1998 | 7.51 | 1.63 % |
| 1999 | 7.97 | 6.12 % |
| 2000 | 7.69 | -3.51 % |
| 2001 | 7.57 | -1.56 % |
| 2002 | 7.76 | 2.62 % |
| 2003 | 8.08 | 4.06 % |
| 2004 | 8.47 | 4.79 % |
| 2005 | 9.06 | 7.00 % |
| 2006 | 10.77 | 18.92 % |
| 2007 | 11.31 | 5.00 % |
| 2008 | 11.43 | 1.06 % |
| 2009 | 12.58 | 10.03 % |
| 2010 | 13.78 | 9.57 % |
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