1999

6.2

2005

6.7

1995

7.9

1999

6.1

1985

7.5

2001

6.5

1994

6.5

1981

7.2

2003

6.1

1967

7.7

2002

6.4

2003

6.0

1972

6.0

1927

6.9

2000

7.4

2017

7.8

1991

7.6

2002

5.4

2020

5.9

2014

6.3