2017

7.4

1989

7.8

1984

6.2

1977

6.8

2008

7.4

2008

7.3

1927

8.1

2009

6.6

2008

6.2

1985

6.2

1974

6.5

1968

6.9

1972

8.7

1943

7.5

1965

7.4

2003

5.0

2006

6.4

1990

6.3

1982

7.3

1966

6.6