1977

5.4

2017

5.8

1976

4.8

7.8

2022

6.7

2007

7.3

1995

7.7

2015

7.4

1998

6.2

1960

8.0

2003

6.1

2013

6.6

1964

7.1

2016

6.5

1955

6.3

1949

7.5

2006

5.5

2010

5.2

2012

4.7

1989

6.6