27.5	1976
32.1	1977
36.0	1978
39.8	1992
40.5	1985
41.1	1984
43.0	1999
43.3	1994
43.3	1979
44.4	1991
45.0	1998
45.6	1990
45.6	1981
46.3	1982
47.7	1975
47.7	1983
47.7	2005
47.2	1993
48.0	2004
48.1	1995
48.9	1987
50.3	2001
50.9	1997
50.8	2000
51.1	1980
51.1	1996
52.4	1988
54.2	2002
54.4	2006
57.7	1989
59.8	2007
64.7	2008