0.0

1998

7.5

1991

6.8

1991

7.3

2005

6.7

1962

7.7

1962

7.6

1996

7.4

2002

6.3

1986

7.3

1976

7.1

2005

6.8

1999

7.1

2017

6.6

2001

7.0

1967

7.3

1979

6.9

1959

7.9

2003

8.3

1968

7.1