1981

5.2

1965

7.0

2003

6.7

2007

6.3

2004

5.5

1977

6.0

2000

0.0

1994

1.0

1998

0.0

2013

6.0

2020

6.0

2014

5.1

1970

6.1

2001

5.0

1998

7.5

1999

5.5

2001

6.2

1995

4.8