1999

7.5

2006

7.4

1980

4.4

1989

6.0

2004

3.8

2014

7.0

2005

4.9

2002

6.4

2002

6.4

2004

5.3

1971

3.7

1972

6.2

2008

3.3

1977

4.5

1990

5.7

2017

6.1

2008

6.8

1973

5.2

1992

7.4

1930

6.8