1944

6.8

1990

6.1

2002

6.3

2001

7.2

1935

7.4

2015

5.4

1989

7.0

2016

5.9

1994

4.5

1992

6.9

1990

6.1

1966

7.8

1968

6.9

2000

6.7

2003

7.3

1989

7.9

1942

7.4

1981

6.5

2009

7.4

2017

6.2