2005

5.5

2008

6.7

2019

5.7

2004

6.7

2016

6.9

2002

7.1

1997

7.0

2017

5.9

2018

7.8

2016

6.5

2007

7.9

1998

7.2

1975

7.1

1962

8.2

1965

7.8

2001

6.9

1950

8.1

1987

7.6

1962

6.0

1970

7.5