1985

5.8

2009

7.5

1966

5.9

2007

6.1

2015

3.0

2004

5.6

1995

6.5

2000

5.8

1967

6.9

2014

6.6

1991

5.3

1969

6.5

2003

6.2

2007

6.9

2003

4.5

2010

7.6

1989

8.1

1972

6.3

2004

3.1

1943

5.4