year production
2008 122.7
2007 128.3
2006 136.6
2005 148.1
2004 162.8
2003 165.5
2002 173.6
2001 180.9
2000 181.2
1999 168.7
1998 168.7
1997 175.9
1996 175.4
1995 156.8
1994 146.3
1993 131.8
1992 124.0
1991 108.5
1990 94.5
1989 86.0
1988 64.7
1987 57.0
1986 48.8
1985 44.8
1984 41.1
1983 35.6
1982 28.5
1981 27.5
1980 28.2
1979 22.5
1978 20.6
1977 16.6
1976 16.2
1975 11.0
1974 2.0
1973 1.9
1972 1.9
1971 0.4