2019

6.2

2006

5.6

2005

5.7

1997

7.1

2005

6.9

2005

6.5

2005

7.3

1976

6.0

1998

7.3

1995

7.3

2003

5.0

1978

4.7

2007

7.2

2002

3.9

1960

8.0

1996

7.5

1990

7.1

1969

4.6

2014

7.2

2018

7.4