1967

6.7

1984

7.3

1971

6.4

2019

6.5

1983

7.9

1988

6.2

2002

4.6

2000

6.8

2012

6.3

2010

7.0

2006

6.0

1976

7.5

1978

6.0

2011

7.0

2002

6.0

2000

6.6

2008

5.6

2011

6.6

1990

5.8

2012

7.3