1964

7.0

2008

6.2

2003

5.6

2007

5.6

2005

6.7

1996

6.5

1973

6.7

1974

7.5

1966

6.3

1971

5.5

1965

6.7

1973

3.1

1981

3.3

1977

7.4

1966

4.3

1980

6.2

1936

6.5

2001

6.2

1966

6.7

2019

5.0