2006

6.7

1973

7.5

2000

5.5

2008

6.3

2007

4.8

2017

6.8

1976

7.0

1984

5.9

2015

6.0

2004

5.6

2007

6.8

2007

5.0

1968

7.6

1976

6.2

1962

4.8

1964

6.2

2020

8.2

1991

5.5

1997

6.1

1959

6.9