2008

6.3

2006

5.0

2002

5.8

2000

5.8

2004

6.7

1980

6.6

2006

4.9

1984

1.0

1971

4.9

1967

6.0

2018

3.2

1990

7.3

1968

6.5

2009

8.0

1988

5.4

1980

6.1

2016

5.5

1934

6.7

2006

6.2

1973

7.3