2008

5.1

2006

6.1

2000

5.1

1966

6.3

2002

5.2

2003

4.9

1992

6.7

1978

7.0

1976

7.2

2003

7.1

1979

6.3

1964

7.0

1999

6.3

1973

7.0

1995

5.4

1999

7.1

1986

7.6

2010

6.2

2015

7.3

2004

6.6