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| year | production | change |
| 1980 | 1.80 | NA |
| 1981 | 2.00 | 11.11% |
| 1982 | 2.20 | 10.00% |
| 1983 | 2.30 | 4.55% |
| 1984 | 2.40 | 4.35% |
| 1985 | 2.50 | 4.17% |
| 1986 | 2.70 | 8.00% |
| 1987 | 2.80 | 3.70% |
| 1988 | 2.70 | -3.57% |
| 1989 | 2.70 | 0.00% |
| 1990 | 2.80 | 3.70% |
| 1991 | 2.90 | 3.57% |
| 1992 | 2.80 | -3.45% |
| 1993 | 3.20 | 14.29% |
| 1994 | 3.30 | 3.13% |
| 1995 | 3.50 | 6.06% |
| 1996 | 4.10 | 17.14% |
| 1997 | 4.20 | 2.44% |
| 1998 | 3.60 | -14.29% |
| 1999 | 4.40 | 22.22% |
| 2000 | 4.80 | 9.09% |
| 2001 | 4.90 | 2.08% |
| 2002 | 5.10 | 4.08% |
| 2003 | 5.40 | 5.88% |
| 2004 | 5.60 | 3.70% |
| 2005 | 5.70 | 1.79% |
| 2006 | 5.90 | 3.51% |
| 2007 | 6.30 | 6.78% |
| 2008 | 6.20 | -1.59% |
| 2009 | 6.70 | 8.06% |
| 2010 | 7.20 | 7.46% |
| 2011 | 7.60 | 5.56% |
| 2012 | 8.40 | 10.53% |
| 2013 | 8.70 | 3.57% |
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