1931

8.1

1958

7.4

1986

7.0

1981

6.5

1953

6.3

2002

6.9

1990

7.4

1953

7.1

1976

6.4

1999

6.3

1982

6.3

2007

5.8

1976

7.3

2017

5.9

2009

7.6

1968

6.7

1963

6.7

2007

5.7

2014

6.1

2020

6.3