2000

4.2

1978

5.2

2017

5.8

2003

4.5

1999

3.8

1972

2.4

2001

3.9

1971

3.5

1982

5.3

1963

4.6

1997

5.1

1997

6.5

1966

4.7

1991

3.0

2005

3.6

2005

5.7

2001

4.3

1974

6.5

2014

6.1

2011

4.8