|
| year | production | change |
| 1980 | 18.12 | NA |
| 1981 | 17.95 | -0.98 % |
| 1982 | 18.92 | 5.44 % |
| 1983 | 20.24 | 6.95 % |
| 1984 | 22.13 | 9.34 % |
| 1985 | 23.31 | 5.33 % |
| 1986 | 24.04 | 3.17 % |
| 1987 | 24.94 | 3.73 % |
| 1988 | 26.15 | 4.84 % |
| 1989 | 27.78 | 6.23 % |
| 1990 | 28.39 | 2.20 % |
| 1991 | 28.82 | 1.54 % |
| 1992 | 29.53 | 2.44 % |
| 1993 | 30.58 | 3.58 % |
| 1994 | 32.51 | 6.29 % |
| 1995 | 33.54 | 3.17 % |
| 1996 | 35.10 | 4.67 % |
| 1997 | 38.44 | 9.51 % |
| 1998 | 38.89 | 1.16 % |
| 1999 | 37.50 | -3.57 % |
| 2000 | 38.78 | 3.42 % |
| 2001 | 41.67 | 7.45 % |
| 2002 | 46.23 | 10.93 % |
| 2003 | 51.25 | 10.86 % |
| 2004 | 55.92 | 9.12 % |
| 2005 | 63.95 | 14.36 % |
| 2006 | 68.23 | 6.69 % |
| 2007 | 73.28 | 7.40 % |
| 2008 | 78.36 | 6.93 % |
| 2009 | 84.06 | 7.28 % |
| 2010 | 90.39 | 7.53 % |
|
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