1977

6.6

1988

5.9

1989

5.0

1973

7.5

1991

6.8

1953

6.5

1984

5.9

1992

5.7

1964

6.2

2007

6.8

1995

5.9

2004

8.4

2018

6.1

2015

6.3

2016

6.8

2007

5.0

1968

7.6

1976

6.2

1962

4.8

1946

6.3