1972

6.7

2007

5.0

1966

7.2

2005

6.7

2015

5.9

2011

4.7

2014

6.1

2006

5.2

2001

5.1

2008

6.3

1994

6.2

1986

6.3

2003

5.4

1998

7.0

1988

5.9

2004

4.7

1984

5.4

1965

7.1

1963

7.0

2001

7.0