2014

6.5

1999

7.0

2007

6.9

2007

6.1

2009

6.3

2001

6.2

1991

5.8

1960

7.3

2002

6.3

1998

5.4

1990

6.5

2018

5.8

1977

6.8

1985

6.2

1956

6.5

2006

6.1

1984

6.3

1975

4.9

1974

5.9

2000

6.5