1969

3.5

1988

7.1

1975

5.6

1976

5.6

2007

4.2

2015

3.0

2013

6.7

2001

5.1

1968

7.6

2003

7.8

2006

7.4

2007

6.1

1977

5.7

2004

5.5

1971

5.2

2023

7.2

1999

5.5

1969

6.5

1968

3.5

1960

6.1