1927

8.1

1995

7.6

1985

7.7

2005

6.5

1982

7.9

1982

6.6

1988

7.9

1997

7.6

1972

6.4

1999

7.4

1983

7.3

1984

6.2

1990

7.3

1987

6.5

2001

5.8

2003

6.2

1998

7.3

2000

6.8

2004

6.5

2004

6.1