1980

8.2

2001

7.8

2002

7.4

2014

6.2

2001

7.8

2002

6.2

2002

6.7

1998

7.1

1957

8.2

2002

7.3

1991

5.9

1951

5.2

2018

4.2

1929

7.4

1996

8.0

1987

7.1

2000

8.0

1997

7.5

1979

8.3

1990

7.7