1937

7.9

1997

7.6

1972

6.4

1951

7.5

1977

7.3

1998

6.9

1995

7.5

1997

7.2

2002

6.4

2001

7.1

1959

7.3

2017

3.2

1931

0.0

1982

8.1

2005

6.0

2006

7.2

2007

6.4

2014

7.4

2007

7.6

2006

6.7