1986

6.8

1993

6.1

2010

5.8

1964

7.3

2008

5.4

1994

4.5

2006

6.0

2005

5.1

2007

6.4

2005

6.1

2008

6.9

1961

7.2

1951

7.2

2011

5.1

2006

5.1

2005

6.6

2018

5.3

1999

5.4

1985

6.5

2002

6.1