1995

7.7

1999

7.1

2009

7.2

1955

6.6

1994

6.8

2001

6.6

1966

5.7

1961

7.7

1938

7.0

1996

6.2

1990

7.0

1972

6.0

1968

6.0

1954

6.7

2007

5.6

1964

6.2

1958

6.4

1975

5.1

1941

7.2

1975

8.0