2015

5.1

1990

6.1

2010

6.6

1993

6.7

1982

5.8

2006

6.8

1989

4.9

1974

7.0

2009

4.7

1981

6.4

2006

5.5

2013

8.0

2020

7.4

1985

5.3

1974

6.3

2007

7.7

1935

6.5

1991

6.1

1965

7.2

2009

7.5