2013

3.5

2011

6.1

2004

9.9

2005

4.7

2000

5.5

2004

6.8

1989

9.2

2020

6.9

1982

7.4

1996

5.3

2018

7.2

2003

5.6

1998

6.3

1972

6.2

1970

6.1

1957

7.2

2001

6.1

1979

6.7

1966

6.7

1987

6.1