2007

8.5

1996

7.7

1997

7.3

1995

8.6

2008

8.9

1960

7.4

2014

8.3

1997

7.3

1990

6.9

2006

8.1

1997

8.4

2007

7.9

1987

8.4

1998

7.1

1999

7.8

2005

7.6

1989

6.7

2003

7.5

2001

8.1

2004

8.3