2003

6.2

1999

6.2

1988

4.2

2005

7.2

2002

7.5

2000

7.8

1988

7.2

1995

8.2

1971

8.2

1932

7.4

1956

7.7

1999

7.4

1989

6.3

1993

6.2

1953

7.3

1997

6.6

1997

6.5

1999

6.1

1964

8.1

2005

6.2