2009

7.1

1974

5.8

1989

5.7

2008

6.1

1984

5.7

2019

4.6

1971

6.2

2007

5.5

1989

5.0

2002

5.7

2006

5.4

1991

6.7

2000

4.4

2009

6.5

1980

6.3

1980

6.3

1979

6.7

2005

4.3

1997

5.2

1976

4.8