1967

6.5

2005

4.9

1982

4.2

2004

7.5

2001

7.5

1967

7.2

1964

5.0

2011

6.6

1963

7.5

2008

4.1

1977

8.1

1959

6.2

1968

5.6

2000

5.0

1979

6.3

2016

6.0

2013

5.9

1990

7.7

1977

6.4

1987

3.7