1951

7.5

1998

8.2

2001

6.2

2000

7.0

1994

8.5

1979

8.3

2015

5.5

1987

8.1

1931

5.2

1997

6.5

2017

7.0

1967

6.5

2018

10.0

2017

7.4

1988

4.5

1986

6.9

2001

6.1

1990

5.0

2007

7.6

2005

7.4