2015

4.0

1975

7.3

1993

7.6

1978

6.3

1985

7.1

1996

6.6

1972

7.1

2001

6.2

2006

6.0

1957

8.2

2006

5.9

2003

7.1

1990

7.7

1982

6.4

1974

8.6

2002

6.7

1995

7.0

1960

8.2

2004

6.8

2002

8.0