2015

6.1

2010

6.9

1992

6.6

1995

7.3

2021

7.2

1972

7.2

2007

6.7

1952

7.9

2004

5.7

2012

5.0

1986

6.3

2006

5.9

1986

5.6

1958

7.1

2006

6.6

2009

4.8

1985

6.2

2006

6.1

2012

5.9

1977

7.4