2001

5.2

1962

6.9

2009

7.4

1991

5.3

1986

6.8

2013

6.8

1986

7.0

1998

5.3

1998

6.7

2007

5.5

2011

6.2

1999

6.8

1989

6.9

1983

6.7

2002

4.6

2000

6.4

1990

7.3

1956

6.6

1987

5.5

1990

6.2