1990

6.9

2000

6.5

1969

6.3

2000

7.0

1998

6.5

1979

7.3

2017

6.8

2005

4.4

2012

5.5

2005

6.1

1976

6.8

2008

6.6

2014

4.5

1971

4.0

1963

7.4

2019

5.0

2009

6.5

1972

2.0

2010

6.0

2014

5.0