2000

6.4

1985

6.2

2006

7.8

2004

6.0

1967

4.3

1999

5.1

2003

5.0

1986

6.3

2009

5.3

1982

6.4

1983

7.9

2006

6.1

1974

7.0

1975

6.6

2012

6.1

2003

6.8

2020

7.3

1983

6.5

2014

5.0

1990

5.8