1950

8.1

2003

7.8

2001

6.2

1972

7.1

2001

7.4

1997

7.0

1962

8.0

1998

6.4

1925

7.6

1995

7.3

1951

7.6

1932

6.9

1995

7.0

1966

8.0

2002

7.2

1989

4.8

1971

7.2

1998

6.9

2005

6.8

2017

5.8