1993

6.6

2000

5.6

1984

5.7

1995

6.8

1990

5.2

2003

7.8

1946

5.8

2008

6.3

1994

6.0

2004

6.5

1993

5.9

1991

6.4

1990

6.0

1999

6.2

1992

7.2

1985

6.7

2020

7.1

1964

7.7

1960

7.5

1987

6.2