1932

7.4

1996

6.4

1967

7.7

1965

7.5

1968

7.1

1973

6.9

1925

7.1

1957

8.3

1994

8.5

2016

6.0

2017

5.4

2017

6.9

1986

6.5

2013

5.3

1999

8.4

1972

7.1

2001

7.4

1995

6.6

1990

7.8

2002

7.3