2007

6.3

1972

6.9

2017

6.4

1999

7.0

1998

6.7

2005

6.5

2005

6.2

2002

7.1

1987

6.6

2000

6.8

1968

6.8

1987

6.0

1994

7.5

1999

7.5

1959

6.5

2005

4.7

2014

5.9

1999

5.7

1986

6.6

1993

6.9