2016

6.8

1982

5.8

1999

5.3

2004

4.7

2003

4.9

2009

4.8

1997

6.6

1999

7.2

1989

5.1

1963

6.8

2001

5.6

7.8

1967

7.3

1976

6.8

1998

6.0

1934

7.5

2005

5.1

1994

6.8

2018

6.0

1977

5.2