2008

3.0

2014

3.5

2017

3.5

1968

3.6

1996

3.0

1977

4.9

2009

6.1

1990

5.9

2021

6.0

1976

3.0

2008

4.4

1975

6.4

2021

1.8

1988

4.3

1973

5.2

2021

4.8

1979

5.8

2005

6.2

2001

5.1

1985

7.2