1968

3.6

2004

3.7

1931

6.9

1987

5.9

1969

4.5

1998

9.5

1975

4.9

1997

6.1

1986

6.4

1998

6.3

2001

5.8

1937

5.5

1985

6.1

1990

6.1

2016

7.1

1990

6.8

2004

6.2

1966

3.5

2000

5.7

1985

7.0