|
| year | production | change |
| 1980 | 1.60 | NA |
| 1981 | 1.67 | 4.58 % |
| 1982 | 1.73 | 3.50 % |
| 1983 | 1.79 | 3.22 % |
| 1984 | 1.85 | 3.78 % |
| 1985 | 1.83 | -0.97 % |
| 1986 | 1.84 | 0.49 % |
| 1987 | 1.83 | -0.52 % |
| 1988 | 1.91 | 3.90 % |
| 1989 | 1.98 | 4.16 % |
| 1990 | 2.01 | 1.50 % |
| 1991 | 2.10 | 4.44 % |
| 1992 | 2.28 | 8.38 % |
| 1993 | 2.48 | 8.64 % |
| 1994 | 2.69 | 8.45 % |
| 1995 | 2.91 | 8.34 % |
| 1996 | 3.03 | 3.99 % |
| 1997 | 3.28 | 8.46 % |
| 1998 | 3.38 | 2.83 % |
| 1999 | 3.41 | 0.91 % |
| 2000 | 3.49 | 2.48 % |
| 2001 | 3.66 | 4.81 % |
| 2002 | 3.57 | -2.34 % |
| 2003 | 3.75 | 4.79 % |
| 2004 | 3.76 | 0.26 % |
| 2005 | 3.75 | -0.23 % |
| 2006 | 3.82 | 2.01 % |
| 2007 | 3.66 | -4.16 % |
| 2008 | 3.64 | -0.51 % |
| 2009 | 3.55 | -2.50 % |
| 2010 | 3.43 | -3.50 % |
|
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