2017

3.8

1992

6.2

2002

4.3

1974

3.3

1981

3.7

1980

4.5

1982

4.2

2002

6.6

2002

6.3

2003

6.8

2004

6.6

2016

6.5

2005

6.5

1978

7.0

1998

6.1

1992

5.7

1967

6.9

1974

5.9

1975

4.3

2003

6.0