1986

3.0

2009

5.9

1974

6.0

1994

5.4

2007

6.4

1967

6.3

1995

1.0

2010

4.2

2008

5.0

1996

5.0

1997

1.0

1976

4.1

2015

4.3

1975

6.1

1973

4.7

1986

4.6

1971

4.9

2009

6.2

2000

6.0

2001

4.7