|
| year | production | change |
| 1980 | 4.50 | NA |
| 1981 | 3.18 | -29.21 % |
| 1982 | 2.86 | -10.18 % |
| 1983 | 2.77 | -3.11 % |
| 1984 | 3.12 | 12.58 % |
| 1985 | 3.36 | 7.66 % |
| 1986 | 3.31 | -1.35 % |
| 1987 | 3.05 | -7.81 % |
| 1988 | 3.30 | 8.20 % |
| 1989 | 3.90 | 18.12 % |
| 1990 | 4.07 | 4.30 % |
| 1991 | 4.30 | 5.67 % |
| 1992 | 4.43 | 2.95 % |
| 1993 | 4.45 | 0.54 % |
| 1994 | 4.37 | -1.82 % |
| 1995 | 4.53 | 3.56 % |
| 1996 | 4.56 | 0.85 % |
| 1997 | 4.85 | 6.27 % |
| 1998 | 4.90 | 1.00 % |
| 1999 | 4.89 | -0.16 % |
| 2000 | 5.18 | 5.87 % |
| 2001 | 5.45 | 5.32 % |
| 2002 | 5.15 | -5.49 % |
| 2003 | 5.71 | 10.76 % |
| 2004 | 5.90 | 3.32 % |
| 2005 | 6.52 | 10.58 % |
| 2006 | 6.32 | -3.04 % |
| 2007 | 6.27 | -0.79 % |
| 2008 | 5.90 | -5.99 % |
| 2009 | 5.71 | -3.14 % |
| 2010 | 6.38 | 11.58 % |
|
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