1987

4.1

1997

7.2

2004

3.2

1985

7.0

2003

7.6

1963

7.7

1969

6.6

2005

6.1

2011

6.6

2006

6.7

2007

5.6

2005

5.6

2001

5.9

2014

7.3

1954

4.6

1962

6.5

1950

6.6

2004

5.6

2006

6.4

1986

6.9