2017

5.5

1993

4.9

1997

6.2

2011

5.2

1990

6.5

2007

5.1

1996

5.7

1972

7.9

2012

7.3

1989

6.2

2015

8.1

1972

6.2

1984

7.2

1987

6.2

1963

8.3

1987

6.8

2011

7.0

1994

4.8

1964

7.0

1964

7.7