2000

6.2

1967

7.2

2007

7.1

2008

7.3

1993

7.5

2002

6.1

1976

7.0

2003

8.0

2000

7.1

1964

8.1

1991

6.4

2003

6.8

2000

6.9

2015

5.6

1999

6.4

1997

7.7

1965

6.0

1987

2.9

2014

6.4

2013

5.5