1984

7.2

1935

6.5

1975

6.4

2002

6.1

1973

6.3

1990

6.0

2008

5.1

1985

4.4

1977

6.7

2015

6.0

2014

5.7

2010

6.5

1989

6.3

6.1

2007

4.9

2007

8.1

2007

6.2

1987

6.3

1991

6.7

1996

5.8