1979

5.6

2004

6.9

1966

6.5

1968

6.5

1963

5.1

2007

5.2

2015

3.7

2006

6.2

1997

6.6

1985

6.5

1997

6.6

1994

5.8

1990

6.4

2014

7.5

1997

6.2

1965

6.1

1974

1.5

1985

6.7

1977

7.0

2003

7.8